Download DC Power Supply HP Model 6296A Operating and Service Manual
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• • DC Power Supply HP Model 6296A Operating and Service Manual • tlf~ .~\ 0 .....--- ----F/ /#1 HEWLETT _ _ _ __ ~~PACKARD OPERATING AND SERVICE MANUAL DC POWER SUPPLY HP MODEL 6296A HP Part No. 06296-90001 SERIAL NUMBER PREFIX 60 I QTS U BR /\ fW I ONE YEAR WARRANTY This HP product has a one year warranty. P!eue rept.:e the first paragraph of the warranty et.atement on the inside front COYer with. the following: Thia Hewlett·Pacbrd hardware product is warranted against deftds in mataial GUI worlananship for a period of one year from date of delivl'ry. HP software ud firmware products, which are designated by HP for me with a hudware product and when property installed on that hardware product. are Waftaftted not to fail to execute their programming instruc:tiDN due to defects in a\aterial and worknwWtip for a period of 90 days from date of delivery. If HP receives notice of such defects during the wmanty period, HP shall ftPair or repi.:e software meda and firmware which do not execvte their progrmnming iN1nlCtioM due to such defeds. HP does not warrant that the operation for the software, finnw.mre or hardware lhall be uninterrupted or mor free. CALL CENTER LIBRARY 11110 llH /U 11111 ml 111111~ ~~11111111111111111111111 2400013351 Printed: December, 1961 CERTIFICATION Hewlett-Packard Company certifies that this product met its published specffications at time of shipment from the factory. Hewlett-Packard further certifies that its calibration measurements are traceable to the United States National Bureau 1af Standards, to the extent allowed by the Bureau's calibration facility, and to the calibration facilities of other International Standards Organization members. • WARRANTY This Hewlett-Packard hardware product is warranted against defects in material and workmanship for a period of one ve•ar from date of delivery. HP software and firmware products, which are designated by HP for use with a hardware produ'ct and when properly installed on that hardware product, are warranted not to fail to execute their programming instructions due to defects in material and workmanship for a period of 90 days from date of delivery. During the warranty period, HP Company will, at its option, either repair or replace products which prove to be defective. HP does not warrant that the operation of the software, firmware, or hardware shall be uninterrupted or error free. For warranty service, with the exception of warranty options, this product must be returned to a service facility designated by HP. Customer shall prepay shipping charges by (and shall pay all duty and taxes) for products returned to HP for warran1ty service. Except for products returned to Customer from another country, HP shall pay for return of products to Customer. Warranty services outside the country of initial purchase are included in HP's product price only if Customer pays HP international prices (defined as destination local currency price, or U.S. or Geneva Expon price>. If HP is unable, within a reasonable time, to repair or replace any product to a condition as warranted, the Customer shall be entitled to a refund of the purchase price upon return of the product to HP. LIMITATION OF WARRANTY The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Customer, Customer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the environmental specifications for the product, or improper site preparation and maintenance. NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. HP SPECIFCALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR .A PARTICULAR PURPOSE. • EXCLUSIVE REMEDIES THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER'S SOLE AND EXLCUSIVE REMEDIES. HP SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY. ASSISTANCE The above statements apply only to the standard product warranty. Warranty options, extended support contracts, produ1:t maintenance agreement$ and customer a$$i$tance 11g1eement$ are also Bvai/able. Contact your nearest Hewlett-Packard Sales and Service office for further information on HP's fuU line of Support Programs. · · • MANUAL CHANGES Model 6296A DC Power Supply · · Manual HP Part No. 06296-90001 • Change Date 10/03/90 Make all corrections in the manual according to errata below, then check the following table for your power supply serial number and enter any listed change(s) in the manual. MAKE SERIAL ERRATA :----------•-------------:I CHANGES Number : Prefix In Table 1-1 (and paragraph 5-20), change the INTERNAL IMPEDANCE AS A CONSTANT VOLTAGE SOURCE (Output Impedance) specification to read: "OUTPl1l' IMPEDANCE {TYPICAL): Approximated by a 5 milliohm resistance in series with a 1 microhenry inductance. I ·----------------------·--------ALL ------- ERRATA 60 00231-00260 1 60 70 70 7M 7M 7H 7M 7M 7H • • 1140A 1140A 1140A 1551A 1552A 1730A 1807A 1816A 1834A 1918A 1929A 2114A 2133A 2234A 2410A 2631A 2841A 2933A 3003A 3024A I 00261-00290 1,2 00291-00320 1,2,3 1-4 00321-00350 00351-00380 1-5 00381-00410 1-6 00411-00522 1-7 00523-00612 1-8 00613-00712 1-9 1-10 00713-01776 01777-01796 1-11 01797-01816 1-12 01817-02411 1-13 02412-02419 1-14 02420-02776 1-15 02777-02956 1-16 02957-02986 1-17 02987-03146 1-18 03147-03386 I 1-19 1-20 03387-03545 1-21 03547-04086 04087-04246 1-22,•23 04247-04486 1-23 04487-04926 1-24 04927-05566 1-25 05567-05916 1-26 05917-06036 1-27 06037-06146 1-28 06147-06206 1-29 06207-up 1-27,29, 30 On page 3-2, Figure 3-4, disconnect strap between terminals A4 and A5. and connect A5 to +S. On page 3-3, Figure 3-6, disconnect strap between terminals A7 and AS and connect A8 +S. Add the following note to paragraph 3-18 on page 3-2 and to paragraph 4-41 on page 4-7: "A protection circuit which protects the series regulator from overload damage is activated whenever: (1) a. short is placed across the supply, or (2) the output is rapidly down progranmed by an increment of more than 4 to 10 volts. When activated, the protection circuit limits the supply's output current to about 101 of rating for a period of from 0.5 to 10 seconds depending on the model and the load conditions." page 5-6, paragraph 5-22, change steps a and f as follows: a. Connect test setup shown in Figure 5-4 with switch 51 closed. f. Insert load resistor (Ry) by opening switch S1. Also, add the following note: "The short circuit protection circuit in this supply will be activated if switch : S1 is closed instead of opened during · this test." On I I I I I I I page 5-8, in Step 3 of Table 5-4, change the text to read : "If it 1s not, proceed to Step 4." On ---------------------------------- 1 Page 2 - HP P/N 06296-90001 changes - continue d ERRATA ERRATA In the parts list on page 6-5: Change C501 to HP P/N 0160-07 10. Change C200 to fxd film .01 uF, 200 V, HP P/N 0160-0161. Change the listing for Q702, 800, 850, 852, 853 to 2N2907A, Sprague 56289, HP P/I 1853 -0099.· .change the part number for C803 to 0180-1986 and its voltage rating to 85 V• . Add pilot light DSl HP P/N 1450-05 66. Change SCR CR502 and CR504 from HP P/N 18840019 to P/N 1884-03 47. On the schemat ic diagram , indicate tbat t . nominal value for R313 is 1 k. ThE! exa ·value for R313 is factory selected to optimize the range of transien t adj\l.st pot R307. In Appendix A, change Figure A-1 Overvol tage Protecti on Crowbar to appear as shown below: DC POWEii Sll'Pl.Y 62-... en ,Page 6-T: Add R865, var ww 250 ohm, HP P/N 2100-0439. Also add Spacer-r ound, HP P/N 0380-1551 and Internal -externa l lockwas her, BP P/H 2190-057 6. Delete the two types of binding posts list and add the followin g: black binding post, HP P/N 1510-01 14, qty. 2 red binding post, HP P/N 1510-01 15. Add: Insulato r (CR502, 504), .HP P/H 5020 -5595. For all instrume nts delivere d on or after July 1, 1978, change the HP P/N for fusehold er from 1400-008 4 to fusehold er body 2110-056 4 and fuseh.o1 der carrier 2110-0565. • On page 6-7: Change the HP P/N for fusehol der nut from 2950-0038 to 2110-056 9. If' old fusehold er must be replaced for any reason, replace complet e · fusehold er and nut with new fusebold er parts. Do not replace new parts with old parts. On page 6-8, note that effectiv e January 1. 1971, Options 007 (10-turn voltage control) and 008 (10-turn current control ) are . no longer availabl e individ ually, but are still availab le combined as Option 009. Likewise Options 013 (10-turn voltage control with decadia l) are · no longer availab le individua lly, but are availab le combined into a single new option designa ted Option 015. Make these changes whereve r Option 007 •. 008, 013, or 014 is mentione d in the manual. • 2 ' Page 3 ·-HP P/N.06296-90001 changes - continued CHANGE ·1 CHANGE 4 Jaif:.. page 6-5, change C500 from 10,000 uF to ~,000 uF, HP P/N 0180-1929. · Make the following changes in the parts list: Add new diode CR603, 1N485B, HP P/N 19010033. Change R313 to 1 k, 5% (selected) 1/2 W, HP P/N 0686-1025. Change R707 to 2 W, I.R.C. Type·BWH, HP P/N 0811-1674. Change R601 to 422 ohm, 1/4 W, HP P/N 069811590. CHANGE 2 On the component location drawing (schematic apron) make the following changes: a. Interchange collector (C) and emitter (E) designations for transistor Q853 on the lower right hand side of drawing. b. Remove TP21 designation from R205 on center left hand side of drawing. The TP21 designation at the bottom of R310 is unchanged. c. TP19 (bottom center) should point to bottom of R300. d •. Interchange locations of Q401 and CR809 at bottom left of drawing. Electrical connections remain the same. Change R870 to 5 k pot, HP P/N 2100-1824. Change R871 to 750 ohm, 11, HP P/N 07570420. Delete R872. Add new Zener diode VR800, 4.22 V, HP PIN 1902-3070. Q-1 the schematic, delete ·R872 in the meter circuit and connect VR800 in its place. The anode of VRSOO goes to base of Q850 and cathode goes to +15.4 V reference. Also, connect CR603 across VR600 in the reference circuit. The anode of CR603 goes to +S and the cathode goes to +9.4 volts. CHANGE 3 .- The serial number prefix of the instrument has been changed from 6D to 70. the parts list and on the schematic, make e following changes: Add new resistor 402, 600 ohm, 5 W, HP P/N 0811-1860 across R309 ( 150 ohm) • Change TSO 1 to HP P/N 9100-2184. CHANGE 5 1lle serial number prefix of the instrument has been changed from 7D to 7M. In the parts list, delete S1 (switch/indicator, ON/OFF) and replace with a separate toggle switch and pilot light as follows: 51, toggle switch, Carling, 2FA53-73-SKI, HP P/N 3101-0984. DS1, pilot light, Neon, Sloan, HP P/N 1450-0048. . Schematic connections to the new switch and pilot light remain the same except that the two are physcially separate. On the schematic, the primary of bias transformer T801 should be connected as shown in the following sketch for 115 Vac operation. For 230 Vac operation, the jumpers between lugs 1 and 3, and 2 and 4 must be removed, and lugs 2 and 3 connected together. In addition, a new power transformer, TSOO, must be installed in accordance with Option 18. TIOI • 3 Page 4 - HP P/N 06296-90001 changes - continued ; --------------------------------------------------------------------HP PART NO. DESCRIPTION :-------------------------------OPTION ------------· : STANDARD l OPTION A85 X95 ----------- Lettered :------------:--------------:-Front Panel,----------: 06296-60004 06296-60001 : ----------<------------ Heat Sink Assembly ,Rear Chassis :eover, Top :chassis, Right Side :chassis, Left Side 5060-7968 5000-9485 5000-9431 5000-9406 5000-9407 <-----~--<---~----<-----~-~ : :: <-----~--- ; <---------- : • 5060-6131 5000-6103 5000-6104. 5000-6098 5000-6099 ------------------------------------------------------------CHANGE ---------13 (Cont) CHANGE 6 Option X95 designates use of the former color scheme of light gray and blue gray. Option A85 designates use of a light gray front panel with olive gray used for all other external surfaces. New part numbers are shown above. · the parts list, change R309 to 125 ohm, 40 W, HP P/N 0811-2621. In CHANGE 7 In the parts list, change R826 to 3.9 k, 5S, 1/2 W, HP P/N 0686-3925. CHANGE 14 CHANGE 8 All primary ac connections have been removed from the circuit board and are now made directly to the transformer primaries. R903 has been removed from the PC board and is now on a new terminal strip (0360-1696) • mounted on the SCR heatsink assembly. Th1ese chan~es do not affect the circuit schematic. the parts list, change R816 to 56 k, 5S, 1/2 W, AB, HP P/N 0686-5635. In CHANGE 9 In the parts list and on the schematic, change R501 and R502 to 22 ohm, 51, 1/2 W, HP P/N 0686-2205. CHANGE 15 TSOO has been replaced by a new transforiner with a dual-winding primary for 115/ 230 Vac operation. The new transformer CHP l?/N 06296-80091) replaces both TSOO transfonn1!rs previously used in this model for 115 V or 230 V operation. CHANGE 10 In the parts list, delete Cable Clamp, HP PIN 1400-0332, qty. 2, and add Terminal Strip, HP P/N 0360-0417. CHANGE 11 Since it is no longer necessary to replace TSOO to convert the supply from 115 to 230 V operation or vice-versa, Option 018 (whJLch equipped the supply for 230 V operation cmly) has been replaced by a new optie>n, Option 028. In the replaceable parts li~>t, remove R903 CHP P/N 0686-1245) (qty 1). The serial prefix of the supply has been changed to 1140A. 1his is the only change. CHANGE 12 In the replaceable parts list and on the schematic, change R702 to 1.5 k, ww, 3 W, HP P/N 0811-1805, and change R709 to 1.6 k, 5S, 1/2 WHP P/N 0686-1625. Option -028 modifies the standard 115 V unit to a 230 V unit as described below. To ccmvert the supply for 230 V operation: a. Remove the jumpers from between terminals terminals 1 and 3, and 2 arid . • 4 of T800. b. Install a jumper between terminals 2 and 3 of T800. · c. Replace F1 with a 3A 250 V fuse (2100-0003). CHANGE 13 The standard colors for this instrument are now mint gray (for front panels and rear panels) and olive gray (for all top, bottom, side, and other external surfaces). 4 ~age 5 - HP P/N 06296-9000·i changes - continued ~ Note: Due to the circuit changes shown.on the next figure, it is no longer necessary change any jumper connections at T801. ~ dual primary windings of T801 are perently wired in parallel across winding 3-4 of T800. The pilot light, in series with R903, is also connected across th1 s winding. I ·~{ AS- AC ~· ..--;_ _ _ _ N ·CHANGE 19 (Cont) lhe procedure for selecting R712 is identical to the one given for 50 Hz operation in paragraph 5-55, steps g through j, except that the resistance value should be selected to ·provide a 3 V +/-.2 V drop across the ·series regulator. (For 50 Hz operation, the voltage drop across the series regulator remains 3.5 V) Center R711 before using the resistance box to determine the value for R712 •. Also change VR600 to 9 V, HP P/N 1902-0785, change R606 to 9 k, HP P/N 698-5454, and change R611 to 490 ohm, 3 W, HP P/N 0811-1801. CIRCUIT PATENTS APPLIED FOR LICENSE TO USE MUST BE OBTAINED IN WRITING FROM HEWLETT-PACKARD CO. HARRISON DIVISION. CHANGE 16 the parts list and on ~he schematic, change R307 to 10 k, 10S, HP P/N 2100-3210. In NOTES: CHANGE 17 1. All resistors are in ohms, 1/2W, +5$ ~the uness otherwise noted. 2. All capacitors are in microfarads unless otherwise noted. parts list and on the schematic, add capacitor C901, 0.1 uF, 250 V. HP P/N 016Q-~0.65 as shown below: N:.c---------- CHANGE 20 In the parts. list and on the schematic for the overvoltage protection crowbar, delete R1 and VR1; add U1 voltage regulator, HP P/N 1826-0276 and C2, fxd elect, 1 uF, 50 V, HP PlN 0180-0230; and change R9 to 1.5 k, HP P/N 0757-0427 and R10 to 1.5 k, 5$, HP P/N 0811-1805 as shown in the schematic.below: C901 F1 ·~~~----------- ""'"' CHANGE 18 s +l~.411 In the parts list and on the schematic, add resistor· R904, 10 ohm, 5S, 1/2 W, HP P/N 0686-1005 in series with the negative lead of capacitor C801. CZ CHANGE 19 ~ the replaceable parts list and on the indicate that 12 k is the nominal value for R712. 1be value for R712 is factory s.elected to optimize the range of ramp adjust pot R711. ~atic, 5 ~ • • Page 6 - HP PIN 06296-90001 changes - continued CHANGE 21 CHANGE 27 In the replace able parts list, change the HP PIN's for the binding posts and associa~ed hardware to the follow ing: Red binding post, qty. 2, 1510-0091; Terminal lug, qty. 2, 0360-0042; Lockwasher, qty. 2, 2190-0079; Nut, qty 2, 2500-0001; .Black binding post, qty 1, 1510-0107;·'· Terminal lug, qty. 1, 0360-1190; Nut, qty. 3, 2950-0144. In the replace able parts list, change t h . part number for the bias transformer from H P/N 9100-2184 to HP P/N 9100-4751. Note that the primary wiring colors have changed, the white/grey is now black/yellow a1:ld the grey is now black. See the figure below. Figure 28a • Transformer Q:innec:tions For 115 v.c 0Pltl11on .CHANGE 22 In the replace able parts list on page 6-7, change S1 (previo usly changed in Change 5) to HP PIN 3101-2456. On page 6-5, change Q40 to HP PIN 1854-0458. ··-.. - ~ ~:y~-~ CHANGE 23 • 'fllis change also applie s to units with serial numbers 2114A-4177; 4190, and 4240. - - =--- ...··-· ,........ ~ '- In the replac eable parts list and on the schematic for the overvo ltage protec tion crowbar, make the follow ing changes: Change C2 (added in Change 20) to 2.2 uF, 20 V, HP PIN 0180-0155. CHANGE 28 In the replace able parts list, change~ Q40 . from HP P/N 1854-1124 to HP PIN 1854-0!158. Add C3, fxd cer, 0.01 uF, 10S, 100 V, HP PIN 0160-4832. . It is to be mounted between the cathode or CR1 and the anode of CR2. CHANGE 29 In the replace able parts list, change the part number for Q851 from HP PIN 185!~-0221 to HP PIN 1854-0229. Change CR4 to a two junctio n stabis tor, HP PIN 1901-0701. CHANGE 24 CHANGE 30 In the replace able parts list on page 64), change R605 to 6.8 k, HP PIN 0757-0750. In the replace able parts list, change! Q400 to HP PIN 06296-80004. Use this part r.tumber for replacement on all units. CHANGE 25 In the replace able parts list, page 6-7 add the follow ing mechanical assembly; Barrie r Strip Guard Assembly HP .PIN 5060-2862, qty 1. CHANGE 26 In the replac eable parts list, page 6-5, change Q400 to HP P/N 1854-1124 QTY 1, and Q303 to HP P/N 1854-1017. • 6 • SAFETY SUMMARY The following general safety precautions must be observed during all phases of operation, service, and repair of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of dnign, manufacture, and intended use of the instrument. Hewlett-Packllrd Company assumes no liability for the customer's failure to comply with these requirements. BEFORE APPLYING POWER SAFETY SYMBOLS Verify that the product is set to match the available line voltage. Instruction manual symbol: the product will be marked with this symbol when it is necessary for the user to refer to the instruction manual (refer to Table of Contents). GROUND THE INSTRUMENT This product is a Safety Class 1 instrument (provided with a protective earth terminal). To minimize shock hazard, the instrument chassis and cabinet must be connected to an electrical ground. The instrument must be connected to the ac power supply mains through a three-conductor power cable, with the third wire firmly connected to an electrical ground (safety ground) at the power outlet. Any interruption of the protective (grounding! conductor or disconnection of the protective earth terminal will cause a potential shock hazard that could result in personal injury. If the instrument is to be energized .via an external autotransformer for voltage reduction, be certain that the autotransformer common terminal is connected to the neutral !earthed pole) of the ac power lines (supply mains!. This instrument is equipped with a line filter ·to reduce electromagnetic interference (EMii, and must be connected to a property grounded receptacle to minimize EMI. • FUSES · Fuses are contained inside the unit, and are not userreplaceable. Only trained service personnel should replace blown fuses, and only after identifying and correcting the problem which caused the fuse(s) to blow. DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE Do not operate the instrument in the presence of flammable gases or fumes. KEEP AWAY FROM LIVE CIRCUITS Operating personnel must not remove instrument covers. Component replacement and internal adjClstments must be made by qualified service pei-sonnel. Do not replace components with the power cable connected. Under certain conditions, dangerous voltages may exist even with the power cable removed. To avoid injuries, always disconnect power, discharge circuits and remove external voltage sources before touching components. Indicates hazardous voltages. @ or .I. or Warning 0 (CAUTION! or Caution I Indicate earth (ground) terminal. The WARNING sign denotes a hazard. It calls attention to a procedure, practice, or the like, which, if not correctly performed or adhered to, could result in personal injury. Do not proceed beyond a WARNING sign until the indicated conditions are fully understood and met. The CAUTION sign denotes a hazard. It calls attention to an operating procedure, or the like, which, if not correctly performed or adhered to, could result in damage to or destruction of part or all of the product. Do not proceed beyond a CAUTION sign until the indicated conditions are fully understood and met. DO NOT CIRCUMVENT SAFETY DEVICES AC mains power exists on exposed terminals in various locations in the mainframe and on the load modules. To protect the user against the danger of electric shock, the unit is equipped with a safety interlock that removes ac mains power when the top cover is removed. Do not attempt to defeat the function of the safety interlock. DO NOT SERVICE OR ADJUST ALONE Do not attempt internal service or adjustment unless another person, capable of rendering first aid and resuscitation, is present. DO NOT EXCEED INPUT RATINGS • Operation at line voltages or frequencies in excess of those stated on the data plate may cause leakage currents in excess of 3.5 mA peak . DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT Because of the danger of introducing additional hazards, do not install substitute parts or perform any unauthorized modification to the instrument. Return the instrument to a Hewlett-Packard Sales and Service Office for service and repair to ensure that safety features are maintained. Instruments which appear damaged or defective should be made inoperative and sscured against unintended operation unril they can be repaired by qualified service personnel. TABLE OF CONTENTS Section Pa~1e No. IV PRINCIPLES OF OPERATION 4-8 Simplified Schematic 'l-3 4-3 4-10 Detailed Circuit Analysis 4-11 Preregulator and Control Circuit•l-3 •l-5 4-19 Series Regula tor 4-21 Constant Voltage Input Circuit 41-5 4-26 ConstantCurrent Input Circuit •l-6 <l-7 4-31 Gating Circuit 4-7 4-34 Error Amplifiers 4-7 4-37 Fault Input Circuit ·~-8 4-42 Reference Circuit 4-46 Meter Circuit ·1-8 Page No. Section 1-1 I GENERAL INFORMATION 1-1 1-l DescriptiOn 1-6 Specifications 1-1 1-1 1-8 Options 1-2 1-10 Accessories 1-2 1-12 Instrument Identification 1-2 1-15 Ordering Additional Manuals II III IV INSTALIATION 2-1 Initial Inspection 2-3 Mechanical Check 2-5 Electrical Check 2-7 Installation Data 2-9 Location 2-11 Rack Mounting 2-15 Input Power Requirements 2-17 SOHz Operation 2-19 Power Cable 2-22 Repackaging for Shipment 2-1 2-1 2-1 2-1 2-1 2-1 2-1 2-2 2-2 2-2 2-2 v 3-1 OPERATING INSTRUCTIONS 3-1 Operating Controls and 3-1 Indicators 3-1 3-3 Operating Modes 3-1 3-S Normal Operating Mode 3-1 3-7 Constant Voltage. 3-1 3-9 Constant Current 3-2 3-11 Connecting Load 3-14 Operation of Supply Beyond 3-2 Rated Output 3-2 3-16 Optional Operating Modes 3-17 Remote Programming. Constant 3-2 Voltage 3-24 Remote Programming. Constant 3-3 Current 3-3 3-30 Remote S.ensing 3-4 3-35 Series Operation 3-5 3-39 Parallel Operation 3-5 3-42 Auto-Tracking Operation 3-45 Special Operating Cons1derat10ns3-6 3-6 3-46 Pulse Loadin; 3-6 3-48 Output Capacitance 3-6 3-51 Reverse Voltage Loading 3-6 3-53 Reverse Current Loading PRINCIPLES OF OPERATION Overall Block Diagram Discussion MAINTENANCE 5-1 Introduction S-3 General Measurement Techniques 5-:.8 Test Equipment Required s-10 Performance Test 5-12 Constant Voltage Tests S-21 Constant Current Tests S-25 Troubleshooting 5-27 Trouble Analysis S-34 Repair and Replacement S-36 Adjustment and Calibration S-38 Meter Zero S-40 Voltmeter Tracking S-42 Ammeter Tracking S-44 Constant Voltage Programming Current S-46 Constant Current Programming Current S-48 Overvoltage Trip S-50 Transient Recovery Time S-52 Preregulator Tracking (60 Hz Operation) S-54 Preregulator Tracking (SO Hz Operation) VI REPIACEABLE PARTS 6-1 Introduction 6-4 6-8 4-1 4-1 Ordering Information Reference Designators Abbreviations Manufacturers Code List of Manufacturers Parts List Table • s-1 S-1 !S-1 :S-1 :S-3 S-4 S-6 S-6 S-7 S-7 S-13 S-13 S-13 S-13 • S-14 S-14 S-14 S-14 5-14 5-14 6-1 6-1 6-1 6-2 4-1 11 • • SECTION I GENERAL INFORMATION 1-1 • c. Series and Auto-Series Operation DESCRIPTION 1-2 This power supply is completely transistorized and suitable for either bench or relay rack operation. It is a compact, well-regulated. Constant Voltage/ Constant Current supply that will furnish full rated output voltage at the maximum rated output current or can be conUnuous1y adjusted throughout the output range. The front panel CURRENT controls can be used to establish the output current limit (overload or shon circuit) when the supply is used as a constant voltage source and the VOLTAGE control can be uaed to establish the voltage limit (ce1Ung) when the supply is used as a constant current source. The supply will automatically crossover from constant voltage to constant current operation and Vice versa if the output CUITant or voltage exceeds these preset limits. Power supplies may be used in series when a higher output voltage is required in the voltage mode of operation or when greater voltage compliance is required in the constant current mode of operation. Auto-Series operation permits one knob control of the total output voltage from a "master" supply. 1-3 The power supply has both front and rear terminals. Either the positive or negative output terminal may be qrounded or the power supply can be operated floating at up to a maximum of 300 volts off ground. The power supply may be used as a "master" supply. havin9 control over one (or more) "slave" supplies that furnish various voltages for a system. e. Auto-Track1n9 SPECifJCATIONS· 1-7 Detailed specifications for the power supply are given in Table 1-1. i-s omoNS 1-S Barrier strip terminals located at the rear of the unit allow ease in adapting to the many operational capabiUU~s of the power supply. A brief description of these capabilities is given below: 1-9 Options are factory modifications of a standard instrument that are requested by the customer. The follOWirlCJ options are available for the instrument covered by this manual. Where necessary. detailed covera9e of the options is included throughout the manual. a. Remote Programming The power supply may be programmed from a remote location by means of an external Option No. voltage source or resistance. • Parallel and Auto-Parallel Qperation The power supply may be operated in parallel with a similar unit when greater output current capability is required. Auto-Parallel operation permits one knob control of the total output current from a "master" supply. 1-6 1-4 A single meter is used to measure either output voltage or output current in one of two ranges. The voltage or current ranges are selected by a METER switch on the front panel. b. d. OS Remote Sensing The degradation in regulation which would occur at the load because of the voltage drop in the load leads can be reduced by using the power supply in the ·remote sensing mode of operation. 1-1 Description SO Hz Regulator Realignment: Standard instruments will operate saUsfactorily at both 60 and 50 Hz without adjustment. However Option 05 factory reall9nment results in more efficient operation at 50 Hz, and is recommended for all applications when continuous operation from a SO Hz ae input is intended . Description Option No. 07 08 09 c:lres ses). i Voltage 10-Tum Control: A single control that replaces both coarse and fine voltage controls and improves output settability. Current l '7'-Turn Control: A single control that replaces both coarse and fine current controls and improves output settablllty. Voltage and Current 10-Tum Controls: Options 07 and 08 on same instrument. 11 Intema 1 Overvoltage Protection "Crowbar". Operating and Service information is included 1n Appendix A at the rear of the manua 1. 13 Three Digit Graduated Decadial Voltage Control: Control that replaces 10-tum voltage control permitting accurate resettability. 14 Three Digit Graduated Decadial • Description 14SlSA Rack Kit for mounting one Si" high supply. (Refer to Section II for details. ) 1452SA Rack Kit for mounting two Si" high supplies. (Refer to Section II for details. ) 1-12 INSTRUMENT IDENTIFICATION 1-13 Hewlett-Packard power supplies are identified by a three-part serial number tag. The first part is the power supply model number. The i;econd part is the serial number prefix, which co•nsists of a number-letter combination that denc>tes the date of a significant design change. The number designates the year, and th,e letter A through M designates the month, January.through December respectively. The third part is the power supply serial number. 1-14 If the serial number prefix on your power supply does not agree with the prefix on the title page of this manual, change sheets are included to update the manual. Where applicable, bac:kdating information is given in an appendix at the rear of the manual. Current Control: Control that replaces coarse and fine current controls permitting accurate resettability. 18 Part No. 230V AC, Single Phase, Input:• Supply is shipped for llSV ac operation. Option 18 consists of modifying the supply for 230Vac operation. 1-lS ORDERING ADDITIONAL MANU~ • 1-16 One manual is shipped with each power supply. Additional manuals may be purchased from your local Hewlett-Packard field office (see list at rear of this manual for addresses). Specify the model number, serial number prefix, and G~ stock number provided on the Utle page. 1-10 ACCESSORIES 1-11 The accessories listed in the following chart may be ordered with the power supply or separately from your local Hewlett-Packard field sales office (refer to list at rear of manual for ad- • 1-2 Table 1-1. Specifications • including a direct short placed across the terminals in constant voltage operation, The constant voltage circuit limits the output voltage in the constant current mode of operation. INPUT: 105-125 VAC. single phase, 50-60Hz, 4. SA, 250W• OUTPUT: 0-60 volts@ 0-3 amps. METER: The front panel meter can be used as either a 0-70 or 0-7 volt voltmeter or as a 0-4 or 0-0. 4 amp ammeter. LOAD REGULATION: Constant Voltage -- Less than 0. 01% plus l mV for a full load to no load change in output current. Constant Current -- Less than 0. 05% plus lmA for a zero to maximum change in output voltage. LINE REGUIATION: Constant Voltage -- Less than 0. 01% lmV for any line voltage change within the rating. Constant Current -- Less than O. 05% lmA for any line voltage change within the rating, OUTPUT CONTROLS: Coarse and fine voltage controls and coarse and fine current controls provide continuous adjustment over the entire output span. OUTPUT TE™INALS: Three "five-way" output posts are provided on the front panel and an output terminal strip is located on the rear of the chassis. .All power supply output terminals are isolated from the chassis and either the positive or negative terminal may be connected to the chassis through a separate ground terminal. If the front panel terminals are used. the load regulation will be O.SmV per ampere greater. due to the front terminal resistance. plus input plus input RIPPLE AND NOISE: Constant Voltage -- Less than 500t£V rms. Constant Current -- Less than 3mA nns. • OPERATING TEMPERATURE RANGES: Operating: o to sooc. Storage: -20 to +ssoc. TEMPERATURE COEFFICIENT: Constant Voltage -- Less than O. 02% plus S0011V ?er degree Centigrade. Constant Current -- Less than O. 02% plus l. 5mA per degree Centigrade. STABILI'IY: Constant Voltage -- Less than 0.10% plus 2. 5mV total drift for 8 hours after an initial warmup time of 30 minutes at constant ambient. constant line voltage. and constant load. Constant Current -- Less than O. 10% plus 7. SmA total drift for 8 hours after an initial warmup time of 30 minutes at constant ambient, constant line voltage, and constant load. INTERNAL IMPEDANCE AS A CONSTANT VOLTAGE SOURCE: Less than O. 001 ohm from DC to lOOHz. Less than O. 01 ohm from lOOHz to lkHz. Less than 0. 2 ohm from lkHz to lOOkHz. Less than 2. 0 ohms f~m l 00 kHz to 1 MHz. • ERROR SENSING: Error sensing is normally accomplished at the front terminals if the load is attached td the front or at the rear terminals if the load is attached to the rear terminals. Also. provision is included on the rear tenainal strip for remote sensing. REMOTE PROGRAMMING: Remote programming of the supply output at approximately 300 ohms per volt in constant voltage is made available at the rear terminals. In constant current mode of operation. the current can be remotely programmed at approximately 500 ohms per ampere. COOLING: Convection cooling is employed. The supply has no moving parts. SIZE: 5}" H x 16" D x Si" W. Two of the units can be mounted side by side in a standard 19" relay rack. TRANSIENT RECOVERY TIME: Less than 50~sec for output recovery to within 15 mv following a current change in the output equal to the current rating of the supply or 5 amperes, whichever is smaller • WEIGHT: OVERLOAD PROTECTION: A continuously acting constant current circuit protects the power supply for all overloads POWER CORD: A three-wire, five-foot power cord is provided with each unit. 1-3 29 lbs. net. 38 lbs. shipping. FINISH: Light gray front panel with dark. gray case. • SECTION II INSTALLATION 2-1 INITIAL INSPECTION 2-2 Before shipmen t, this instrum ent was inspect ed and found to be free of mechan ical and electric al defects . As soon as the instrum ent is unpacke d, inspect for any damage that may have occurre d in transit. Save all. packing materia ls until the inspection is complet ed. If damage is found. proceed as describ ed in the Claim for Damage in Shipme nt section of the warrant y page at the rear of this manual. MECHANICAL CHECK 2-4 This check should confirm that there are no broken knobs or connec tors, that the cabinet and panel surface s are free of dents and scratch es, and that the meter is not scratch ed or cracked . 2-3 2-5 ELECTRICAL CHECK 2-6 The instrum ent should be checked against its electric al specific ations. Section V include san"incabinet " perform ance check to verify proper instrum ent operatio n. INSTALLATION DATA 2-8 The instrum ent is shipped ready for bench operatio n. It is necessa ry only to connect the in2-7 • strumen t to a source of power and it is ready for operatio n. 2-9 LOCATION 2-10· This instrum ent is air cooled. Sufficie nt space should be allotted so that a free flow of cooling air can reacn the sides anci rear of the ins trumenc when itis inopera tion. It should be used in an area where the ambient tempera ture does not exceed sooc. 2-11 RACK MOUNTING 2-12 This instrum ent may be rack mounted in a standar d 19 inch rack panel either alongsi de a similar unit or by itself. Figures 2-1 and 2-2 show how both types of installa tions are accomp lished. 2-13 To mount two units side-by -side, proceed as follows : a. Remove the four screws from the front panels of both units. b. Slide rack mountin g ears between the front panel and case of each unit. c. Slide combini ng strip between the front panels and cases of the two units. d. After fastenin g rear portions of u_nits together using the bolt, nut, and spacer, replace panel- screws • RAC!( EM -- .. -· 6el .... • 8 -0 -0 -· 0 COllllNlltG STlllP Figure 2-1. Rack Mounti ng, Two Units 2-1 -0 • I Q .... ti 0 0 .1 cl r-¥0L.TACE-, C.OAAS( r1-.[ (j (j 0 10 • c I Q Figure 2-2. Rack Mounting, One Unit be realigned. This realignment procedure is described in Paragraph 5-54 at the rear of the·manual. 2-14 To mount a single unit in the rack panel, proceed as follows: a. Bolt rack mounting ears. combining straps, and angle brackets to each side of center spacing panels. Angle brackets are placed behind combining straps as shown in Figure 2-2. b. Remove four screws from front panel of unit. c. Slide combining strips between front panel and case of unit. d. Bolt angle brackets to front sides of case and replace front panel screws. 2-19 POWER CABLE 2-20 To protect operating gersonnel, the National Electrical Manufacturers' Association (NEMA) recommends that the instrument panel and ca:binet be grounded. This in&trument is equiPped with a three conductor p01Ner cable. The third cond·uctor • is the ground conductor and when the cable is plugged into an appropriate receptacle, the instrument is grounded. The offset pin on the power cable three-prong connector is the ground connection. 2-15 INPUT POWER REQUIREMENTS 2-16 This power supply may be operated from either a nominal 115 volt or 230 volt 50-60 cycle power source. The unit, as shipped from the factory, is wired for 115 volt operation only. A factory modification (Option 18) must be made to permit operation from a 230 volt line. The input power required when operated from a llS volt, 60 cycie power source at full load is given in the s~ecification table in Section I. 2-21 To preserve the protection feature when operating the instrument from a two-contact outlet, use a three-prong to two-prong adapter and c:onnect the green lead on the adapter to ground. 2-22 REPACKAGING FOR SHIPMENT 2-23 To insure safe shipment of the instrument, it is recommended that the package designed for the instrument be used. The original packaging material is reusable, If it ls not available, contact your local Hewlett-Packard field office ~:o obtain the materials. This office will also furnish the address of the nearest service office to which the iT\strument can be shipped. Be sure to attach a tag to the instrument which specifies the o·wner, model number, full serial number, and SE~rvice required, or a brief description of the troublE!. 2-17 SO Hz OPERATION 2-18 Theunit as normally shipped from the factory can be operated from either a 50 or 60 Hz source. However, with a 50 Hz input, the operation of the unit may become somewhat deqraded when the temperature exceeds 350 Centigrade (instead of the normal soocentigrade capability with a 60 Hz input). To permit optimum operation at 50 Hz, the unit must 2-2 • • SECTION III OPERATING INSTRUCTIONS OPERATING CONTROLS AND INDICATORS 3-1 3-2 The front panel controls and indicators , together with the normal turn-on sequence, are shCM'n in Figure 3-1. 0 ll(f(I 3-5 NORMAL OPERATING MODE 3-6 The power supply is normally shipped with its rear terminal strapping connectio ns arranged for Constant Voltage/C onstant Current, local sensing, local programming, single unit mode of operation . This strapping pattern is illustrated in Figure 3-2. The operator selects either a constant voltage or a constant current output using the front panel controls Oocal programming, no strapping changes are necessary }. TURN-ON SEQUENCE I. 2. PUSH ON/OFF BUTTON ANO BUTTON SHOULO LIGHT. SET METER SWITCH TO C&SIREO VOLTAGt llAN'GE. Figure 3-2. Normal Strapping Pattern ADJUST COARSE AND nNE VOLTAGE CONTROLS UNTIL lXSllED OUTPUT VOLTAGE IS INOICATl:D ON METER• ~. SET METER SWITCH DESIRED CURRENT ltANGt AND SHORT CIR• CUIT OUTPUT TERMINALS. s. ADJUST CURRENT CONTROLS f'OR cc;nu;o OUTPUT ci.nuu:m. ~. R.CMOV!: SHORT AND CONNECT ~TO OUTPUT TERMINALS ll'RONT OR REAR!. 3. • CONSTANT VOLTAGE 3-8 To select a ronstant voltage output, proceed as follows: Figure 3-1. Front Panel Controls and Indicators 3-3 • 3-7 a. Turn-on power supply and adjust VOLTAGE controls for desired output voltage {output terminals open). OPERAnNG MODES b. Short output terminals and adjust CURRENT controls for maximum output current allowable (current limit), as determined by load conditions. If a load change causes the current limit to be exceeded , the power supply will automatic ally crossove r to constant current output at the preset current limit and the output voltage will drop proportionate ly, In setting the current limit, allowance must be made for high peak current which can cause unwanted cross-ove r. (Refer to Paragraph 3-46). 3-4 The power supply is desiqned so that its mode of operation can be selected by making strapping conne~tions between particular terminals on the terminal strip at the rear of the power supply. The terminal designatio ns are stenciled in white on the power supply above their respective terminals . Although the strapping patterns Ulustrated in this section show the positive terminal grounded, the operator can ground either terminal or operate the power supply up to 300 vdc off ground (floating). The following paragraph s describe the procedure s for utilizing the various operation al capabiliti es of the power supply. A more theoretica l descriptio n concerning the operational features of this supply is contained in a power supply Applicatio n Manual and in various Tech. Letters published by the Harrison Division. Copies of these can be obtained from your local Hewlett-P ackard field office. 3-9 CONSTANT CURRENT 3-10 To select a constant current output. pro· ceed as follows: a. Short output terminals and adjust CURRENT controls for desired output current. 3-1 b. Open output terminals and adjust VOLTAGE controls for maximum output voltage allowable (voltage limit), as determined by load conditions. If a load change causes the voltage limit to be exceeded, the power supply will automatically crossover to constant voltage output at the preset voltage limit and the output current will drop proportionately . In setting the voltage limit, allowance must be made for high peak voltages which can cause unwanted crossover. (Refer to Paragraph 3-46). NOTE When Model 6291A is operated continuously in the crossover region. between Constant Voltage/Constant Current, the feedback loop may break into oscillation; particularly in the 0. SA to l. SA output current range. Although the crossover region is not usually an area of continuous operation, this problem can be eliminated, if necessary, by connecting the emitter of Q300 to +S (instead of to the emitter of Q301) and readjusting R307. Note that when this is done, the transient recovery time of Model 6291A must be derated to "SOµsec for recovery to within 25mV" (instead of lSmV). 3-11 CONNECTING LOAD 3-12 Each load should be connected to the power supply output terminals using separate pairs of connecting wires. This will minimize mutual coupling effects between loads and will retain full advantage of the low output impedance of the power supply. Each pair of connecting wires should be as short as possible and twisted or shielded to reduce noise pickup. (If shield is used, connect one end to power supply ground terminal and leave the other end unconnected. ) 3-16 OPTIONAL OPERATING MODES 3-17 REMOTE PROGRAMMING, CONSTANT VOl~T AGE 3-18 The constant voltage output of the power supply can be programmed (controlled) from a remote location if required. Either a resistance or voltage source can be used for the programming device. The wires connecting the programming terminals of the supply to the remote programmir1g device should be twisted or shielded to reduce noise pick-up. The VOLTAGE controls on the front panel are disabled according to the followi.ng procedures. ~ ~ ~ +· + G - - ~ ~ M M M ~ M 1°1~1~1 PROGRAMMING RESISTat Figure 3-3. Remote Resistance Programming (Constant Voltage) 3-19 Resistance Programming (Figure 3-3). In this mode. the output voltage will vary at a rate determined by the programming coefficient, 200 ohms per volt (300 ohms per volt for Model 6296A). The output voltage will increase l volt for each 200 ohms (or 300 ohms) added in series with the programming terminals. The programming coeffi-cient is determined by the pr09rammin9 current. This current is factory adjusted to within 2% of S ma (2% of 3. 3 ma for Model 6296A). If greater programming accuracy is required, it may be achieved by changing resistor R806. 3-13 If load consideration s require that the output power distribution terminals be remotely located from the power supply, then the power supply output terminals should be connected to the remote distribution 'terminals via a pair of twisted or shielded wlres and each load separately connected to the remote distribution terminals. For this case. remote &ensing should be used {Paragraph 3-30). • • 3-20 The output voltage of the power supply should be zero volts z20 millivolts when zero ohms is connected across the programming termi·nals. 3-21 To maintain the stability and temperature coefficient of the power supply, use programmin~; resistors that have stable, low noise, and low temperature (less than 30 ppm per degree Centigrade) characteristic s. A switch can be used in conjunction with various resistance values in order to obtain discrete output voltages. The switch should have make-before-b reak contacts to avoid momentarily opening the programming terminals during the switching interval. 3-14 OPERATION OF SUPPLY BEYOND RATED OUTPUT 3-15 The shaded area on the front panel meter face indicates the amount of output voltage or current that is available in excess of the normal output. Althouoh the supply can be operated in this shaded region without being damaged, it cannot be guaranteed to meet all of its performance specifications . Hawever, if the line voltage is maintained above 115 Vac, the supply wil~proba bly operate within its specifications . 3-22 Voltage Programming (Figure 3-4). Employ the strapping pattern shown on Figure 3-4 for voltage programming. In this mode, the output voltage will vary in a 1 to 1 ratio with the pro- 3-2 . • • ;ramming voltage (reference voltage) and the load on the programming voltage source will not exceed 25 microamperes. Al 46 A2 + + G - - •S AJ A4 AS A6 A7 Al 101~1r1m1 coefficient and stability specifications . A switch may be used to set discrete values of output current. A make-before-b reak type of switch should be used since the output current will exceed the maximum rating of the power supply if the switch contacts open during the switching interval. CAUTION If the programming terminals (Al and A7) should VOLTAGE open at any time durinq this mode, the output current will rise to a value that may damage the power supply and/or the load. To avoid this possibility, connect a lK resistor (1. SK for Models 6290A and 6296A) across the programming terminals. Like the programming resistor, this resistor should be of the low noise, low temperature coefficient type, SOURCE Figure 3-4. Remote Voltage Programminq (Constant Voltage) 3-23 The impedance matching resistors (Rx) for the programming voltage source should be approximately 1000 ohms to maintain the temperature and stability specifications of the power supply. 3-28 Voltage Programming (Figure 3-6). In this mode. the output current will vary linearly with changes in the programming voltage. The programming voltage should not exceed 1. 5 volts. Voltage in excess of 1. 5 volts will result in excessive power dissipation in the instrument and possible damage, 3-24 REMOTE PROGRAMMING, CONSTANT CURRENT 3-25 Either a resistance or a voltage source can be used to control the constant current output of the supply. The CURRENT controls on the front panel are disabled according to the following procedures • • VOLtACE SOURCE PROGRAMMING lu:slStoR Figure 3-6. Remote Voltage Programming (Constant Current) Fiqure 3-S. Remote Resistance Programming (Constant .Current) 3-29 The output current will be the programming voltage divided by the internal current sampling resistance RSOO. The current required from the voltage source will be less than 10 microamperes. The impedance matching resistor (Rx) should be approximately 1000 ohms if the temperature coefficient and stability specifications of the power supply are to be maintained. 3-26 Resistance Pn?qrammins (Figure 3-5). In this mode, the output current varies at a rate determined by the programming coefficient -- 100 ohms per ampere for Models 6282A and 6286A, 200 ohms per ampere for Models 6285A and 6291A, and 500 ohms per ampere for Models 6290A and 6296A. The programming coefficient ls determined by the Constant Current programming current l mA for Models ~282A, 6285A, 6286A, and 6291A or O. 66 mA for Models 6290A and 6296A. This current is adjusted to within 10% at the factory. If qreater programming accuracy is required, it may be achieved by changing resistor R808 as outlined in Section V. • 3-30 REMOTE SENSING (See Figure 3-7) 3-31 Remote sensing is used to maintain good regulation at the load and reduce the degradation of regulation which would occur due to the voltage drop in the leads between the power supply and the load. Remote sensing is accomplished by utilizing the strapping pattern shown in Figure 3-7. The power supply should be turned off before changing strapping patterns. It is not required 3-27 Use stable, low noise, low temperature coefficient (less than 30 ppm/Oc) programming resistors to maintain the power supply temperature 3-3 r"Al"""'l"'--r~r--.,..-..,.;;;...----....-..--.....-..,.;.;;~A6.;;.,.;117 that these leads be as heavy as the load leads. However, they must be twisted or shielded to minimize noise pick-up. U ~~~~c@ 0 • Fiqure 3-7. Remote Sensing Figure 3-8. Normal Series Connectii:>ns CAUTION is used, the output voltage is the sum of the voltaqes of the individual supplies. Each: of the individual supplies must be adjusted in oz'der to obtain the total output voltage. The powe·r supply contains a protective diode connected int~!mally across the output which protects the supply if one power supply is turned off while its serie:; partner(s) is on. Observe polarity when connecting the sensing leads to the load. 3-32 Note that it is desirable to minimize the drop in the load leads and it is recommended that th~ drop not exceed 1 volt per lead if the power supply is to meet its DC specifications. If a larger drop must be tolerated, please consult a Hewlett-Packard field representative. 3-37 Auto-Series Connections (Figure 3-~ll.. The Auto-Series configuration is used when it is desirable to have the output wltage of each of the series connected supplies vary in accordc1nce with the setting of a control unit. The control unit is called the master; the controlled units arE! called slaves. At maximum output voltage, the voltage of the slaves is determined by the setting of the front panel VOLTAGE control on the mastei~. master supply must be the most positive supply the series. The output CURRENT controls of all series units are operative and the current limit is equal to the lowest control setting. U any output CURRENT controls are set too low, automatic crossover to constant current operation wl.11 occur and the output voltage will drop, Remote sensing and programming can used: however, the strapping arrangements shown in the applicable fig1J.res show local sensing and programming. NOTE Due to the voltage drop in the load leads, it may be necessary to readjust the current limit in the remote sensing mode. Th. 3-33 The procedure Just described will result in a low DC output impedance at the load. If a low AC impedance is required, it is recommended that the following precautions be taken: a. Disconnect output capacitor C803 by disconnecting the strap between A2 and +s. b. Connect a capacitor having similar characteristics (approximately same capacitance, same voltage rating or greater, and having good high frequency characteristics) across the load·using short leads, Al 0 MASTER 0 St.\VE 3-34 Although the strapping patterns shown in Figures 3-3 through 3-6 employ local sensing, note that it is possible to operate a power supply simultaneously in the remote sensing and Constant Voltage/Constant Current remote proqramming modes. 3-35 SERIES OPERATION 3-36 Normal Series Connections (Figure 3-8). Al Two or more power supplies can be operated in series to obtain a higher voltage than that available from a single supply. When this connection Figure 3-9. Auto-Series, Two Units 3-4 • • 3-38 In order to maint ain the tempe rature coeffi cient and stabil ity specif icatio ns of the pc)wer supply , the extern al resist or (Rx) shown in Figure 3-9 should be stable , low noise, low tempe rature coeffi cient (less than 30 ppm per degree Centi grade) resisto rs. The value of this resist or is depen dant on the maximum voltag e rating of the "mast er" supply . The value of Rx is this voltag e divide d by the voltag e programming curren t of the slave supply (l/Kp where Kp is the voltag e programming coeffi cient) . The voltag e contri bution of the slave is determ ined by its voltag e contro l setting. 3-39 • Figure 3-11. Auto- Parall el. Two Units PARALLEL OPERATION 3-40 Normal Parall el Conne ctions (Figure 3-10). Two or more power suppli es can be conne cted in parall el to obtain a total outpu t curren t greate r than that availa ble from one power supply , The total outpu t curren t is the sum of the outpu t currents of the indivi dual power suppl ies. The output CURRENT contro ls of each power supply can be separa tely set. The output voltag e contro ls of one power supply should be set to the desire d outpu t voltag e: the other power supply should be set for a slight ly larger outpu t voltag e. The supply set to the lower output voltag e will act as a consta nt voltag e source : the supply set to the higher output will act as a consta nt curren t source , droppi ng its outpu t voltag e until it equals that of the other supply . The consta nt voltag e source will delive r only that fractio n of its total rated outpu t curren t which is neces sary to fulfill the total curren t deman d. to the maste r's regard less of the load condit ions. Becau se the outpu t curren t contro ls ot each slave are opera tive, they should be set to maximum to avoid having the slave revert to consta nt curren t operat ion: this would occur if the maste r output curren t settin g excee ded the slave 's. 3-42 AUTO-TRACKING OPERATION (See Figure 3-12) St.Avt •MASTER MUST Bl: MOST FOS111VE SUPPLY Figure 3-12. Figure 3-10. • Auto-Tracki~g, Two Units 3-43 The Auto-T rackin g config uratio n is used when it is neces sary that severa l differ ent voltages referr ed to a common bus, vary in propor tion to the settin g of a partic ular instru ment (the control or maste r). A fractio n of the maste r's outpu t voltag e is fed to the compa rison ampli fier of the . slave supply , thus contro lling the slave' s output The maste r must have the larges t output voltag e of any power supply in the group (must be the most positi ve supply in the·ex ample shown on Figure 3-12). Normal Parall el Conne ctions 3-41 Auto- Parall el. The strapp ing patter ns for Auto- parall el operat ion of two power suppli es are shown in Figure 3-11. Auto- Parall el operat ion permi ts equal curren t sharin g under all load condition s, and allows compl ete contro l of outpu t curren t fron:i one maste r power supply . The output curren t of each slave will be approx imatel y equal 3-S 3-44 The output voltage of the slave is a percentage of the master's output voltage, and is determined by the voltage divider consisting of Rx and the voltage control of the slave supply, Rp. where: Es= Rp/Rx + Rp. Tum-on and tum-off the power supplies is controlled by the master. Remote sensing and programming can be used; although the strapping patterns for these modes show only local sensing and programming. In order to maintain the temperature coefficient and stability specifications of the power supply, the external resistors should be stable, low noise, low temperature (less than 30 ppm per 0 c) resistors. current is large enough to cause the constant cur-rent circuit to operate. 3-50 The effects of the output capacitor during • constant current operation are as follows: a. The output impedance of the power supply decreases with increasing frequency. b. The recovery time of the output voltage is longer for load resistance changes. c. A large surge current causing a high power dissipation in the load occurs when the load resistance is reduced rapidly. 3-45 SPECIAL OPERATING CONSIDERATIONS 3-51 REVERSE VOLTAGE LOADING 3-46 PULSE LOADING 3-52 A diode is connected across the output terminals. Under normal operating conditions, the diode is reverse 'biased (anode connected to negative terminal). If a reverse voltage is applied to the output terminals (positive voltage applied to negative terminal), the diode will conduct, shunting current across the output terminals an1d limiting the voltage to the forward voltage drop of the diode. This diode protects the series transistors and the output electrolytic capacitor. 3-47 The power supply will automatically cross over from constant voltage to constant current operation, or the reverse, in response to an increase (over the preset limit) in the output current or voltage, respectively. Although the preset limit may be set higher than the average output current or voltage. high peak currents or voltages (as occur in pulse loading) may exceed the preset limit and cause crossover to occur. If this crossover limiting is not desired, set the preset limit for the peak requirement and not the average. 3-5 3 3-48 OUTPUT CAPACITANCE 3-49 An internal capacitor, connected across the output terminals of the power supply, helps to supply high-current pulses of short duration during constant voltage operation. Any capacitance added externally will improve the pulse current capability, but will decrease the safety provided by the constant current circuit. A high-current pulse may damage load components before the· average output REVERSE CURRENT LOADING 3-54 Active loads connected to the poweir supply may actually deliver a reverse current to the P°"'tA supply during a portion of its oper~ting C}'Cle. external source cannot be allowed to pump current into the supply without loss of regulation and possible damage to the output capacitor. To avoid these effects, it is necessary to preload the supply with a dummy load resistor so that thei power supply delivers current through the entire operating cycle of the load device. A19 • 3-6 • SECTION IV PRINCIPLES OF OPERATION H R£1'£RENCE CIRCUIT T AC I FOWD TRANS TORM DI - BIAS SUPPLY r--- REFERtNCE VOLTAGES - 8JAS -VOLTAG ES RECTIFIER/ I. CURRENT SAMPlJNG " RESJS10R ERROii AMPL. • SCA - L<J FAULT INPUT CJRCIJIT • ~ FEECIACl PATH GATING CIRCUIT ... VOL?AGE .,_ CONStAHT INPUT - DC OUTPUT ClllCUIT - T COtmlOL CJllCUJT - DENOTES VOLTAGE -± ... REGULATOR .... MOTE: .... SERIES PllEREGUIJIlOR, nLTER - CONSTANT CURRENT INPUT CIRCUIT .... ' ~ MtTER CIRCUIT ... • l - ,.. - - - - DENOTES CURRENT FtEDIACl MTH Figure 4-1. Overall Block Diagram 4-1 plishes this by issuing a firing pulse to one of the SCR's once during each half cycle of the input ac. The control circuit continuo usly samples the output voltage, the input line voltage, and the voltage across the series regulato r and, on the basis of these inputs, determin es at what time during each half cycle that the firing pulse will be generated. OVERALL BLOCK DIAGRAM DISCUSSION 4-2 The power supply, as shown on the overall block diagram on Figure 4-1, consists of a power transform er, a rectifiei -preregu lator-fil ter, preregulato r (SCR) control circuit, series regulato r, error amplifie rs. gating circuit, a constan t voltage input circuit. a constant current input circuit, a fault input circuit, a referenc e circuit, bias supply, and a meter circuit. • 4-4 The series regulato r. part of another feedback loop, is made to alter its conducti on to maintain a constant output voltage or current. Its conduction varies in accordan ce with feedback control signals obtained from the error amplifier . It should be noted that the series regulato r provides fine and "fast" regulatio n of the output, while the preregul ator handles large relativel y "slow" regulation demands . The de current from the series regulato r passes through a current sampling resistor before reaching the positive output terminal . 4-3 The input line voltage is reduced to the proper level by the power transform er and coupled to a rectifier bridge consistin g of two rectifier diodes and two SCR's. The bridge simultan eously performs the necessa ry rectifyin g and preregu\ ating function s. The SCR's, oper~ting in conjunc tion with a control circuit, minimize the power dissipate d by the series regulato r by keeping the yoltage drop across the regulato r at a low and constant level. The SCR control circuit accom- 4-1 PIO - - . ~ .• " . -• IEFEllENCE UGtll-'TOa 0600 THlU 0503 l"' ctoo::: I .....-- 2 CHOI - -•.zv •9.fV ~ _ •6.2V ~ I •YOLt!I CllOO u •1~4V CUlllENT - (NOU 2) J ... INPUT CIRCUIT ' 0200 -s l>-U ~ ... CIOO: ~ HO~ I nNE CUUENt/ cu:r...i :-:aot -1.zv .1 I TIOO ~- PllllllVnoN IUV DBI - 3 I I 1903 TOFF - I . ·~-,1 AC Sl ~ "' :: . •... •• ISO CISO ~50 : 504 CISOI 2 ISOl - - I PIO 9 ) • SCI COlnlCL ClllCU1T 0100.0101. 0102 rl '10 Cl404, - i - r. '? TIO! Al -0 1827 .,. ,; i- !5_0~ ../ COMSE Clt40l 1 Cltl02 : 1125 CllS02 4 smi:s UGO QG. CUllU:NT Q400IQ401) :.~JIOnJ • •9.olV llSIS101 • - "' •U05 0303 GlllNG ClllCVIT 0300. 0301 1111:· . AMU. 0102. • FAULT UfPUT CllCUlT •· ·-- .QIDI - - u @ nm: ~814 YOLts,/. ADJ. """2 CS09= 1. VOLTAGE ACROSS CIOO rel &ACK MODEL IS SllOWJI IUDW1 MODEL NO. '212A &USA '2t~ - 62IOA '211A 1216A YOL1S CDC> 16. 2 11.2 16. 2 u.2 11.2 21.2 l. l'OSITM lllAS VOLTAGE "FOR UCH MODEL l$ SHOWJll · IELOW: MQPQ. NO. 6282" &285" &216A 129DA '291A 1216A YOL1S (DC) •lSV •I 7V •UV •2DV '17V •ZDY 3. VOLTAGE ACROSS INPUT FILD:a CAPACITOR FOR PCB MOmL IS SHOWN IELOW: 6282" IS 62 HA U Ul6A 24 i290A 4!> l29U. 45 ADJ. MftP ~ CllCUJT 0150 tlllt"" Ol5J,S2 • ·-· . 1 .,~~: =-,_,f802 - llOLts ) :i:.13 { , ,, COMSE r.7 NOTIS: __ j YOl.DGE ·INPUT cac:UIT 0100 - u MQQEL NO. YOLlS (DC) ~110 ADJ. Cl!_80l 15 ACC • CHOO TIOI 8 J -s . ~ uu. ' J . -· &ZHA &S Fiqure 4-2. Simplified Schematic • 4-2 • 4-S The feedback signals that control the conduction of the series regulator are originated within the constant voltage input circuit or the constant current input circuit. The output voltage of the power supply is sampled by the constant voltage input circuit by means of the sensing terminals {:S). The voltage developed across the current sampling resistor is the input to the constant current input circuit. This voltage drop varies in direct proportion to the output current. Any changes ·in output voltage/current are detected in the constant voltage/constant current input circuit, amplified by the gating and error amplifiers, and applied to the series regulator in the correct phase and amplitude to counteract the changes. • DETAILED CIRCUIT ANALYSIS 4-11 PREREGUIATOR AND CONTROL CIRCUIT 4-12 The prere9ulator minimizes changes in the power dissipated by the series regulator due to output voltage or input line voltage changes. Preregulation is accomplished by means of a phase control circuit utilizing SCR's CRS04 and CRS02 as the switching elements. The appropriate SCR is fired once during each half-cycle (8.33 milliseconds) of the rectified ac (see Figure 4-3). Notice that when the SCR is fired at an early point during the half-cycle, the de level applied to the series regulator is fairly high. When the SCR is fired later during the cycle, the de level is relatively low. The fault input circuit detects the presence 4-6 of overvoltage or overcurrent conditic:>ns and generates the necessary tum-down signals to the SCR control circuit or the series regulator circuit. In the case of an overvoltage condition, a tumdown signal is applied to the SCR control circuit. The series regulator receives a turn-down signal via the gating circuit if an overcurrent condition is detected. • 4-10 60Hz AC INPUT ~ I ' I • '-8. JMs-.:1 I I I I IAll~;c~ --~ I The reference circuit provides stable refer4-7 ence voltages which are used by the constant voltage/current input circuits for comparison pur• poses. The bias supply furnishes voltages which are used throughout the instrument for biasing purposes. The meter circuit provides an indication of output voltage or current in one of two ranges. I • ' • . I I I EARLY I rIRINC I I I SMALL DC __ : LEVCL I I '-.\ i POINT ~I~: .Y- - - ~ - - -~ \ /. U.oER 4-8 rIRINC POlllT SIMPLIFIED SCHEMATIC -Figure 4-3. SCR Phase Control of DC Input Level A simplified schematic of the power supply 4-9 is shown in Figure 4-2. It shows the operating controls; the ON-off pushbutton, the voltage programming controls (R813 and R814) and the current programming controls (R809 and R810). The METER switch, i-ncluded in the meter circuit block on Figure 4-2, allows the meter to read output voltage or current in one of two ranges. Figure 4-2 also shows the internal sources of bias and reference voltages and their nominal magnitudes with an input of 115 Vac and no load connected. Diode CR809, connected across the output terminals of the power supply, is a protective device which prevents internal damage that might occur if a reverse voltage were applied across the output terminals. Output capacitor, C809 stabilizes the feedback loop when the normal strapping pattern shown in Figure 4-2 is employed. Note that this capacitor can be removed if an increas~ in the programming speed is desired. Under these conditions, capacitor C802 serves to insure loop stability. Resistors R811 and R812 limit the output of the supply if the straps between the output and sensing terminals are inadvertently opened. 4-13 The SCR control circuit (See Figure 4-4) samples the input line voltage, the output voltaQe, and the voltage across the series transistor. It generates a firing pulse, at the time required, to fire the SCR so that the voltage across input capacitor CSOO will be maintained at the desired level. 4-14 The inputs to the control circuit are algebraically summed across capacitor C700. All inputs contribute to the time required to charge C700. The input line voltage is rectified by CR704 through CR707, attenuated by voltage divider R700 and : R701. and applied to the summing point at TP 59 via capacitor C700. Capacitor C701 is used for smoothing purposes. 4-15 Transistor Q702, connected in a common base configuration, provides a charging current for the summing capacitor which varies in accordance with the input signals applied to its emitter. 4-3 H:IO -0 SERIE.; REG. "'~ -0 -0 +v •V R708 1710~ 10 CJ R707 Cll708 ;iti=t~ -6.Zv •V ~E CRSQQ R9QJ • 4 CR902 SCll"S 0702 CR900 11 C700 SUMMING CAPACJroR R900 ~I ~ :;~p 12 C70Z R701 R705 •15. 4V CR711 CR710 AJ>J. C701 R706 R709 •6.2V Figure 4-4. SCR Control Circuit, Simplified Schematic Resistor R713, connected between the negative output line and the emitter of Q702, furnishes a signal which is proportional to the output voltage. Resistors R708 and R707 sample the voltage across, and the current through, the series regulator. Capacitor C702 and resistor R709 stabilize the control circuit feedback loop. Resistors R7ll and R712 are the source of a constant offset current which sustains a net negative charging current to the summing point, ensuring that the SCR's will fire at low output voltages. .--r FIRING TP59 SUMMING POINT l:V THR£5HOU> I - -~-.....:l I "'-8. lMS TP47 OUTPUT 0700 ~NOTE 3) I I I l 11 I nn ; '-1:- : TP46 l'llUNG PULSE (EXPANDED) I , ' I c··-J l' • J_ I I TPSZ RESET l!iV _J_ I I I 4-16 The summation of the input signals results in the generation of a voltage waveform at TP 59 similar to that ~hewn on Figure 4-S. When the linear ramp portion of the waveform reaches a certain negative threshold voltage, diodes CR711 and CR710 become forward biased. The negative voltage then is coupled to the base of transistor Q701. Transistors Q701 and Q700 form a squaring circuit resembling a Schmitt trigger configuration. Q701 is conducting, prior to firing time, due to ·the positive bias connected to its base through R705. Transistor Q700 is cut off at this time because its base is connected directly to the collector of conducting transistor Q701. When the negative threshold voltage is reached, transistor Q701 is turned off which turns Q700 on. The conduction of Q700 allows capacitor C703 to discharge rapidly through pulse transformer T700 resulting in the SCR firing pulse shown on the • ----r 1911 --1. NOTES; l. ALL WAVEFORMS REFERENCED TO INBOARD SIDE or CURRENT SAMPLING RESISTOR R800 EXCEPT l'IRJNG PULSE WHICH IS REFEll· ENCED TO T. P. 45. 2. FOR CLAllJTY WAVEFORMS ARE NOT 3. DRAWN TO SCALE. AMPLITUDE OF THIS WAVEFORM IS APPROXIMATE ANO VAIUES SUGHTLY l'ROM MODEL 'TO MODEL IN AC· COROANCE WITH THE POSmvE COLLECTOR BIAS OBTAINED FROM caoo. Figure 4-5. SCR Control Circuit Waveforms 4-4 • • ·serves as the series, or "pass", element which provides precise and rapid control of the output. The conduction of the series translstor(s) ls controlled by the feedback signals obtained from driver Q303. Diode CR400, connecteii across the regulator circuit, protects the series element(s) from reverse voltages that could develop ac.;ross them during parallel operation if one supply is turned on before the other. diagram. The firing pulse ls. relatively narT"ow because Q700 saturates rapidly causing the magnetic field surrounding T700 to collapse. Diode CRSOO damps out the negative overshoot. 4-17 Reset of the control circuit occurs once every 8.33 milliseconds when the rectified ac voltage at test point 52 recedes to a level at which diode CR709 becomes forward biased. Summing capacitor C700 is then allowed to discharge through CR709. Diodes CR711 and CR710 become reverse biased at reset and transistor Q701 reverts to its "on" state. Consequently, Q700 is turned off and capacitor C703 charges up through R703 at a comparatively slow rate until the collector voltage of Q700 reaches approximately +17 volts. The above action causes the small negative spike that appears across the winding of pulse transfonner T700 at reset time. 4-21 CONSTANT VOLTAGE INPUT CIRCUIT (See FigurP 4-6) 4-22 The circuit consists of the programming resistors (RB13 and R814) and a differential amplifier stage (QlOO and associated components). Transistor QlOO consists of two silicon transistors housed in a single package. The transistors have matched characteristics minimizing differential voltages due to mismatched stages. Moreover, drift due to thermal differentials ls minimized, since both transistors operate at essentially the same temperature. 4-18 Capacitor C900, diode CR900, and ~stor R900 fonn a long time constant network which achieves a slow tum-on characteristic . When the unit is firSt turned on, C900 provides a positive voltage to the cathode of CR71 l to ensure that lt ls initially reverse biased. After C900 becomes fully charged, the control circuit ls permitted to fire the SCR's. Diode CR902 provides a discharge path for C900 when the unit ls turned off. • 4-19 4-23 The constant voltage input ctrcuit continuously compares a fixed reference voltage w 1th a portl.On of the output voltage and, if a difference exists, produces an error voltage whose amplitude and phase is proportional to the difference. The error output is fed back to the series regulator, through the gating and error amplifiers. The error voltage changes the conduction of the series regulator which, in tum, alters the output voltage SERIES REGUIATOR 4-20 The series regulator (transistor Q400 or Q400 and Q401, see schematic at rear Of manual) RIOOA •6.ZV +9.('i 10 . ~TING.__-+...., ll07 CIUOZ _ _ _,. __.,._ _ llOS PU1.LOUT CIRcurT U:S.ISTCll +U,4¥ ll03 RlO' RlOI -6.%V R105 CIOl •6.ZV • Figure 4-6. Constant Voltage Input Circuit, Simplified Schematic 4-S uo• so that the difference between the two input voltages applied to the differential amplifier is reduced to zero. This action maintains the output voltage constant. the programming resistors, increase the high frequency gain of the input amplifier. Resistor R806, shunting the pullout resistor, serve1s as a trimming adjustment for the programming current• • Diode CR102 establishes the proper collector bia for QlOOA while R103 and ClOO proVide low frequency equalization for the feedback loop. 4-24 Stage QlOOA of the differential amplifier is connected to a common (+S) potential through impedance equalizing resistor Rl06. Resistors Rl02 and Rl 08 are used to zero bias the input stage. offsetting minor base to emitter voltage differences in QlOO. The base of QlOOB is connected to a summing point (A4) at the junction of the programming resistors and the current pullout resistor RSOS. Instantaneous changes in the output (due to load variations) or changes due to the manipulation of RBl 3, result in an increase or decrease in the summing point potential. 01008 is then made to conduct more or less, in accordance with summing point voltage change. The change in QlOOB's conduction also varies the conduction of Ql OOA due to the coupling effects of the common emitter resistor, RIOS. The "errorn voltage is taken from the collector of QlOOA and ultimately varies the conduction of the series regulator. 4-26 CONSTANT CURRENT INPUT CIRCUI'I' (See Figure 4-7) 4-27 This circuit is similar in appearance and operation to the constant voltage input circ:uit. It consists of the coarse and fine current pr01;ramming resistors (R809 and RS! O), and a difforential amplifier stage (Q200 and associated components). Like transistor QlOO in the voltage input ciircuit, Q200 consists of two transistors, having matched characteristics, that are housed in a singl1~ package. 4-28 The constant current input circuit continuously compares a fixed reference voltage with the voltage drop across the current sampling re:sistor. If a difference exists, the differential amplifier produces an "error" voltage which is propo1rtional to this difference. The remaining components in the feedback loop (amplifiers and series re·;ulator) function to maintain the drop across the cu:rrent sampling resistor, and consequently the output current, at a constant value. 4-25 Resistor Rl04, in series with the base of QlOOB. limits the current through the programming resistors during rapid voltage tum-down. Diodes CRlOO and CRlOl form a limiting network which prevents excessive voltage excursions from over driVing stage QlOOB. Capacitor C801, shunting • -i.2V -r..zv ?O ---+--... GATING--~-..... ClllCUIT 1801 P11U.OVT RESISTOR ltl08 CIOS -L2V RIOOA R827 Figure 4-7. Constant Current Input Circuit, Simplified Schematic 4-6 • • 4-36 Capacitor C900, diode CR901, and resistor R902 form a long time constant network which achieves a slow tum-on characteristic. When the unit is first turned on, C900 provides a positive voltage to the base of Q302 keeping the series regulator from conducting initially. As C900 charges up, the restrictive bias becomes less positive enabling the regulator to conduct. Diode CR902 provides a low resistance discharge path for C900 when the unit is turned off. 4-29 Stage Q200A is connected to +S through impedance equalizing resistor R203. Instantaneous changes in output current on the positive line are felt at the current summing point (terminal A7) and, hence, the base of Q200B. Stage Q200B varies its conduction in accordance with the polarity of the change at the summing point. The error voltage is taken from the collector Q200B and ultimately varies the conduction of the series regulator. 4-30 Resistor R304, in conjunction with C300, helps stabilize the feedback loop. Resistor R808, shunting the pullout resistor, serves as a trimming adjustment for the programming current flowing through R809 and R810. 4-31 • 4-37 4-38 The fault input circuit (see schematic at rear) protects the power supply against overvoltage and overcurrent conditions. Transistor 0800, and associated components, comprise the overvoltage detector. With normal output voltages QSOO is cut off due to the +15.4V reference voltage connected to the top of voltage divider R823 and R821. If the output voltage exceeds a certain limit (about 20% above the maximum rated output voltage) transistor QSOO is driven into conduction. Current is then conducted away from the summing point and in opposition to the charge path of C700 in the SCR control circuit. As a result, the SCR' s are fired at a later time, reducing the series regulator input voltage to a safe value. GATING CIRCUIT 4-32 The gating circuit (see schematic) consists of gating amplifiers Q301 and Q300 and associated OR-gate diodes, CRJOO and CR301. The gating circuit provides sharp crossover between constant voltage and constant current operation. During steady state conditions, one transistor is saturated while the other is conducting in its linear region. The cathodes of the OR-gate diodes are always at a more positive potential than the satuation potential of 0300 or Q301. Thus, the diode associated with the saturated transistor is reverse biased while the diode associated with the other transistor is forward biased. In the constant voltage mode Q301 is operating in its linear region and Q300 is saturated due to the positive collector voltage of Q200B. OR-gate diode CR301 is therefore reverse biased while OR-gate diode CR300 is forward biased, coupling the constant voltage feedback si9nal to the error amplifier. Opposite conditions prevail during constant current operation. 4-39 A full wave rectified voltage, obtained from the SCR control circuit, excercises a stabilizing influence on transistor QBOO. This signal tends to synchronize the conduction of QBOO at a 120 Hz rate preventing random firing of the SCR' s. 4-40 Transistors Q801 and Q802 provide overcurrent and short circuit protection for the unit. Overcurrent protection is accomplished by Q802 which is activated only 1f the constant current input circuit should fall. Q802 monitors the voltage drop across the current sampling resistor and conducts if this drop exceeds a certain level. The output of Q802 is fed to gating amplifier QJOl via R815 and ultimately reduces the conduction of the series regulator. 4-33 Capacitor C302 is a commutating capacitor which improves the transient response of the unit. Resistor R300 is the biasing resistor for the ORgate diodes. 4-34 ERROR AMPLIFIERS 4-41 Short circuit protection is provided by transistors Q801 and Q802. Transistor Q801, normally biased below cutoff, monitors the voltage drop across the series regulator. Under short circuit conditions, the ·increased voltage across the regulator drives Q801 into saturation. The positive going emitter voltage of Q801 also drives Q802 into conduction. The output of Q802 limits the current flow through the series regulator to a prescribed leve 1. 4-35 The error amplifiers Q302 and QJOJ, amplify the feedback. si9nal from the constant voltage or constant current input circuit to a level sufficient to drive the series regulator transistor. Transistor Q303 serves as the driver and Q302 the predriver. for the series regulator. The RC network, composed of C301 and R307, is an equalizing network which provides for high frequency rolloff in the loop gain response in order to stabilize the feedback loop . • FAULT INPUT CIRCUIT 4-7 4-42 REFERENCE CIRCUIT (See Schematic at Rear) tected by Q602 and Q603. The error voltage is amplified and inverted by Q601 and appli.ed to series requlator Q600 in the correct phase and amplitude to maintain the +15.4 volt output c o n . stant. 4-43 The reference circuit is a feedback power supply similar to the main supply. It provides stable reference voltages which are used throughout the unit. The reference voltages are all derived from smoothed de obtained from the full wave rectifier (CR600 and CR601) and filter capacitor C600. The +9.4 and -6.2 voltages are developed across temperatu re compensa ted Zener diodes VR600 and VR60l. Resistor R611 limits the current through the Zener diodes to establish an optimum bias level. 4-46 4-44 The regulating circuit consists of series regulating transistor Q600, error ammplifie r Q601, and differenti al amplifier Q602 and Q603. The voltage across the Zener reference diode VR600 and the voltage at the junction of divider R605 and R606 are compared, and any difference s are de- 4-47 The meter circuit (see Figure 4-8) provides continuou s indication s of output voltage •lr current on a single multiple range meter. The meter can be used either as a voltmeter or an ammeter depending upon the position of METER switch S2 on the front panel of the supply. This SVl'itch 4-45 Zener diode VR601 provides an add:ltiona l bias voltage of -6.2 volts. Resistor R60l, connected across Q600, minimiZes power di:;sipatio n in the series element. Output capacitor C602 stabilizes the reference regulator loop. METER CIRCUIT 1800 CtJRllENT SAM PUNG Rl:SJSTOR CSI R853 R869 I 18SZ • RB62 RB61 11851 RB&O R8'1 R872 QH2 R857 RISO HOtt: S2 FOSmoNS FOR I>IFFERENT MOI>EU ARE SHOW?-! BELOW: MODEL 628ZA 628;.\ 6286A 629~A 6291.\ 6Z96A I S2 TERl\.!TN& NOS. 2 3 4 l.2V 2. 4V 2.4V 12V 24V Z4V ;v sv. ;ov sov 7V 70V HA 6A IZA l.ZA .6A l.ZA 4A 6A .4A .6A 4A .u. Figure 4-8. Meter Circuit. Simplified Schemati c 4-8 • • to stage Q851B while stage Q851A is grounded to the +S terminal. In the low current range, the voltage drop across R853 and R854 is applied to Q851B. also selects one of two meter ranges on each scale. The metering circuit consists basically of a selection circuit (switch S2 and associated voltage dividers), a stable differential amplifier staqe (QBSlA and Q8518), two meter amplifiers (Q852 and Q853), and the meter movement. Differential amplifier stage Q851 is a stable device having a fixed gain of ten. To minimize temperature effects, the two stages are housed in a single package that is similar to those used in the constant voltage and current input circuits. The outputs of the differential amplifier drive meter amplifiers Q852 and Q853 which, in turn, deflect the meter. Transistor Q850 provides a constant bias current to the emitters of Q852 and Q853. Potentiometer R870 permits electrical zeroing of the meter. 4-49 4-48 The selection circuit determines which voltage divider is connected to the differentia 1 amplifier inpu~. When S2 ls in one of the voltage positions, the voltage across divider RBSO, RBSl. and R852 (connected across the output of the supply) is the input to the differential amplifier. When 52 is in one of the current positions, the voltage across divider R853, R854, and RSSS (connected across the sampling resistor) is the input to the differential amplifier. With S2 in the higher voltage range (position 2) the voltage drop across R852 is applied to stage Q851A while stage Q851B is grounded tothe +s terminal. For low output voltages, S2 can be set to position (1) resulting in the application of a larger percentage of the output voltage (drop across RSS l and RBS 2) to stage Q851A. With 52 in the higher current position (3) the voltaqe drop across R853 is applied 4-50 The meter circuit contains an inherent current limiting feature which ~rotects the meter movement against overloads. For example, lf ME1'~R switch 52 is placed in the low current range when the power supply is actually delivering a higher ampere output, the differential amplifiers are quickly driven into saturation, limiting the current through the meter to a safe value . • • 4-9 • SECTION V MAINTENANCE 5-1 INTRODUCTION 5-2 Upon receipt of the power supply, the performance check (Paragraph 5-10) should be made. This check is suitable for incoming inspection. If a fault is detected in the power supply while making the performance check or during normal operation. proceed to the troubleshooting procedures (Paragraph S-41). After troubleshooting and repair (Paragraph S-46), perform any necessary adjustments and calibrations (Paragraph 5-48). Before returning the power supply to normal operation, repeat the performance check to ensure that the fault has been properly corrected and that no other faults exist. Before doing any maintenance checks, tum on power supply, allow a half-hourwarm-up, and read the 'general information regarding measurement techniques (Paragraph 5-3). • 5-3 Figure 5-1. Front Panel Terminal Connections tor. The four terminals are connected as shown in Figure 5-2. In addition, the resistor should be of the low noise, low temperature coefficient Oess than 30ppmfOC) type and should be used at no more than 5% of its rated power so that its temperature rise will be minimized. GENERAL MEASUREMENT TECHNIQUES 5-4 The measuring device must-be connected across the sensing leads of the supply or as close to the output terminals as possible when measuring the output impedance, transient response, regulation. or ripple of the power supply in order to achieve valid measurements. A measurement made across the load includes the impedance of the leads to the load and such lead lengths can easily have an impedance severa 1 orders of magnitude greater than the supply impedance. thus invalidating the measurement. S-5 The monitoring device should be connected to the +S and -s terminals (see Fic;ure 3-2) or as shown in Figure S-1. The performance characteristics should never be measured on the front terminals if the load is connected across the rear terminals. Note that when measurements are made at the front terminals. the monitoring leads are connected at A, not B, as shown in Figure S-1. Failure to connect the measuring device atA willresuitin a measurement that includes the rest.stance of the leads between the output terminals and the point of connection. • LOAD LEAD CURRENT SAMPLING TERMINALS TO UNGROUNDED TERMINAL OF TO GROUNDED +-W.--~W.."'0---1• POWER SUPPLY TERMINAL OF POWER SUPPLY Figure 5-2. Output Current Measurement Technique 5-7 When using an oscilloscope, ground one terminal of the power supply and then ground the case of the oscilloscope to this same point. Make certain that the case is not also grounded by some other means (Power line). Connect both oscillo. scope input leads to the power supply ground terminal and check that the oscilloscope is not exhibiting a ripple or transient due to ground loops, pickup, or other means. s-e TEST EQUIPMENT REQUIRED S-9 Table 5-1 lists the test equipment required to perform the various procedures described in this Section. S-6 For output current measurements, the current sampling resistor should be a four-terminal rests- 5-1 Table 5-1. Test Equipment Required Type Require d Charac teristic s Recommended: Model Use Differe ntial Voltme ter Sensitiv ity: 1 mv full scale (min.J. Input impeda nce: 10 megohms (min.). Measur e DC voltage s; calibra tion procedu res ~ 3420 (See Note) Variabl e Voltage Transfo nner Range: 90-130 volts. Equipped with voltmet er accurat e within 1 volt. Vary AC input ---------------- AC Voltmeter Accuracy: 2%. Sensitiv ity: 1 mv full scale deflecti on (min.). Measur e AC voltage s and ripple ~ 403 B Oscillo scope Sensitiv ity: 100 ~v/cm. Differe ntial input. Display transie nt respons e wavefo rms ~ Oscilla tor Range: SHz to l MHz. Accuracy: 2%. Impeda nce checks e 200 CD DC Voltme ter Accuracy: 1%. Input resistan ce: 20, 000 ohms/v olt (mtn.l. Measur e DC voltage s ~ 412A Repetit ive Load Switch Rate: 60 - 400 Hz, 21'5eC rise and fall time. Measur e transie nt respons e See Figure 5-7 Resisti ve Loads Value: See Paragra ph 5-14. and Figure 5-4. ::1:5% 250 watts. Power supply load resistor s -------------··-- Current Samplin g Resisto r Value: See Figure 5-4. 111. 200 watts, 20ppm. 4-Term inal. Measur e current : calibra te meter Resisto r l'Kt.. ::1:1%. 2 watt non-ind uctive Measur e impeda nce ---------------- Resisto r 100 ohms. i:S%. 10 watt Measur e impeda nce -------------··-- Value: See Paragra ph 5-45. Calibra te programming current -------------··-- Resisto r • 140 A plus 1400A plug in. • -------------·--- :tO. 1%. 20 watt. 5-2 • • Recommended Model Type Required Characteristic s Resistor Value: See Paragraph 5-47. :t:O. 1 %. l/2 watt. Calibrate programming current ---------------- Capacitor 500µ.f, 50 wvdc Measure impedance. ---------------- Decade Resistance Box Range: 0-SOOK. Accuracy: 0. 1% plus l ohm Make-before-b reak contacts. Measure programming coefficients. ---------------- Use NOTE A satisfactory substitute for a differential voltmeter is to arrange a reference voltage source and null detector as shown in Figure S-3. The reference voltage source is adjusted so that the voltage difference between the supply being measured and the reference voltage will have the required resolution for the measurement being made. The voltage difference will be a function of the null detector that is used, Examples of satisfactory null detectors are: S 419 A null detector, a DC coupled oscilloscope utilizing differential input, or a SO mv meter movement with a 100 division scale. For the latter, a 2 mv change in voltage will result in a meter deflection of four divisions. • CAUTION Care must be exercised when using an electronic null detector in which one input terminal is grounded to avoid ground loops and circulating currents. REfUENCt POWtR SUPPLY VOLTAGE SOURCE UNDER TEST S-10 PERFORMANCE TEST 5-11 The following test can be used as an incoming inspection check and appropriate portions of the test can be repeated either to check the operation of the instrument after repairs or for periodic maintenance tests. The tests are per fonned using a 115-VAC 60 cps., single phase input power source. If the correct result is not obtained for a particular check, do not adjust any controls; proceed to troubleshootin g (Paragraph 5-28) • 0 LOAD NllU. "DETECTOR • Figure 5-3. Differential Voltmeter Substitute, Test Setup S-3 5-12 CONSTANT VOLTAGE TESTS 5-13 Rated Output and Meter Accuracy. POWER SUPPLY 5-14 Voltage. UNDER ?£ST Proceed as follows: MODEL NO. a. Connect load resistor across rear output terminals of supply. Resistor value to be as follows: Model 6282A 628SA 6286A 6290A 6291A 6296A Res. 1"'. 4A ~ llA ~ 20~ b. Connect differential voltmeter across +S and -s terminals of supply observing correct polarity. c. Set METER switch to highest voltage range and turn on supply. d. Adjust VOLTAGE controls until front panel meter indicates exactly the maximum rated output voltage. e. Differential voltmeter should indicate maximum rated output voltage within :t2%. 5-15 Current. a. Connect test setup shown in Figure 5-4, leaving switch S l open. b. Tum CURRENT controls fully clockwise. c. Set METER switch to highest current range and turn on supply. d. Adjust VOLTAGE controls until front panel m~ter indicates exactly the maximum rated output current. e. Differential voltmeter should read 1. 0 z O. 02 Vdc. 1. 9 POWER Sll~Pl.Y UNDER TEST 6286A 6289A 6290A 6291A 6294A 6296A 6299A 0. 20 0. JO 0. l3 0. 20 0. 10 0. 66 0. 33 0. 20 I. 0 0. 33 I. 33 I. 30 zi 13 7. 80 59 19. 66 131 OtrrtRENTIAL VOLTMETER Load Regulation, Constant Voltc:1ge d. Adjust VOLTAGE controls until front panel meter indicates exactly the maximum rated output voltage. e. Read and record voltage indicated on differential voltmeter. f. Disconnect load resistors·. g. Reading on differential voltmeter should • not vary from reading recorded in step e by more than the following (variations expressed in mV"dc): Model 6282A 6285A 6286A 6290A 6291A 64!96A Variation :t2 :3 :1:3 :1:5 :5 :t7 5-17 Line Regulation. l'o check the line regullation, proceed as follows: OIFrtllENTlAL VOL?MCTER RESISTOR a. Connect variable auto transformer between input power source and power supply power input. b. Turn CURRENT controls fully clockwise. c. Connect test setup shown in Figure s-s. d. Adjust variable auto transformer for 105 VAC input. e. Set METER switch to highest voltage range and turn on supply. f. Adjust VOLTAGE controls until front panel meter indicates exactly the maximum rated output voltage. g. Read and record voltage indicated on. differential voltmeter. • h. Adjust variable auto transforn:ier for l.25 VAC input. Figure· 5-4. Output Current Test Setup S-16 Load Regulation. To check constant voltage load regulation, proceed as follows: a. Connect test setup as shown in Figure 5-5. b. Turn CURRENT controls fully clockwise. c. Set METER switch to highest current range and turn on supply. S-4 • 0. 90 6 3. 80 I. 90 If measurements are made at the front terminals, readings will be O.SmV per amp greater due to front terminal resistance. ll ?. 8 19 66 SAM PUNG 6281A 6282A 6284A 6285A R NOTE 0. 90 l. 8 CURRCNT R Figure S-5. Proceed as follows: I • POWtR SUPPLY UNDER TEST i. Reading on differential voltmeter should not vary from reading recorded in step g by more than the following (variations expressed in mVdc): Model 6282A 628SA 6286A 6290A 6291A 6296.A Variation :2 :±3 :1:3 :5 ±5 :7 0 5-18 Ripple and Noise. To check the ripple and noise, proceed as follows: OSCILLOSCOPE ,, 140A + 0-+--------------------1-.0 CONTACT PROTECTION Ntl'WORIC l..ld I" SW 200V (NOTE 31 G 0 Ry Rx f----·Vlll.--..l\/V\.--1 a. Retain test setup used for previous line regulation test except connect AC voltmeter across output terminals as shown in Figure 5-6. b. Adjust variable auto transformer for 125 VAC input. c. Set METER switch to highest current range. d. Turn CURRENT controls fully clockwise and adjust VOLTAGE controls until front panel meter indicates exactly the maximum rated output voltage. e. AC voltmeter should read less than O. 50mVrms. ., I NOTES: I. THIS DRAWING SHOWS A SVCGESTED METHOD or BUILDING A L~D SWITCH. HOWMR. OTHER METHODS COULD IE USED: SUCH AS A TRANSISTOR SWITCHING NETWORK. MAXIMUM LOAD RAnNGS or LOAD SWITCH ARE; S AMPS. SOOV. ZSOW INOT 2S0'1Wl 2. USE MERCURY REIAY: CURE TYPE HGP I 002 OR W. E. TYPE 2768. l. USE Wtat WOUND ~ODEL NO. 6282A 628SA 6286A 6290A 6291A 6296" POWER SUPPLY UNDER 'ltST RESIS A~· Rx 0.10 0.20 0.10 0. 33 0.20 0. 33 RC.~ISTOR. •~u~•• a., I 0.90 3. 80 1.90 13. 0 7. 80 1'. 66 Figure S-7. Transient Response, Test Setup • f. Adjust 2SK potentiometer until a stable dis play is Qbtained on oscilloscope. Waveform should be within the tolerances shown in Figure S-8 (output should return to within 15 mV of original value in less than 50 microseconds). LOAO RtSISTORS AC VOLTMma ,, 403 • f---so....~ J__ I ISMV I ov-r-----__,,,c....____,i;;:::;::;._-r-- Figure S-6. Ripple and Noise. Constant Voltage 5-19 Transient Recovery Time. To check the transient recovery time proceed as follows: I 1-so..stc-t a. Connect test setup shown in Figure 5-7. b. Turn CURRENT controls fully clockwise. c. Set METER switch to highest current range and turn on supply• . d. Adjust VOLTAGE ~ontrols until front panel meter indicates exactly the maximum rated output current or S amperes, whichever is smaller. e. Close line switch on repetitive load switch setup. UNLOADING TRANSIENT ~DING TRANSIENT Figure 5-8. Transient Response Waveforms _:s-20 Output Impedance. To check the output impedance, proceed as follows: a. Connect test setup shown in Figure S-9 • • 5-5 VOLTMEltR INDICATES E;n ~ ) (> 0 POWER SUPPLY ~/ 0 5-23 Line Regulation. To check the line regulation, proceed as follows: OSCIUATOR ft 200 CD UNDER TtsT / f. Short out load resistor (Ry) by closj.ng switch Sl. g. Reading on differential voltmeter should not vary from reading recorded in step e by more than the following {variations expressed in mVdc): • 6282A 628SA 6286A 6290A 6291A li296A Model Variation :1.:0. 60 :1:2. 20 :1.:0. 60 :t0.830 :t0.70 :1::0.830 VOLTMmlt 40) I Ir Ip 40) B INDICATES E0 - .... .__ ~+c h I 'J\11."v ..!IC. SQO MrD \I -11+ a. Utilize test setup shown in Fiqure 5-4 leaving switch Sl open throughout test. b. Connect variable auto transformer b1!tween input power source and power supply power input. .. ·: · c. Adjust auto transformer for lOSVAC input. d. Turn VOLTAGE controls fully clockwise. e. Set METER switch to highest current range and tum on supply. f. Adjust CURRENT controls unW front panel meter reads exactly the maximum rated output current. g. Read and record voltage indicated (Jn differential voltmeter. h. Adjust variable auto transformer fo1~ 125 VAC input. i. Reading on differential voltmeter sltlould not vary from reading recorded in step 9 by more than the following {variations expressed in mVdc): 6282A 628SA 6286A 6290A 6291A 6296A Model Variation :1:0.60 :1:2.20 :t0.60 :t0.830 :tQ.70 :i:0.830 H U> I 100 OHM Figure S-9. Output Impedance, Test Setup b. Set METER switch to highest voltage range turn CURRENT controls fully clockwise, and turn on supply. c. Adjust VOLTAGE controls until front panel meter reads 10 volts. d. Set AMPLITUDE control on Oscillator to 10 volts (Ein>. and FREQUENCY control to lOOHz. e. Record voltage across output terminals of the power supply (Eo) as indicated on AC voltmeter. f. Calculate the output impedance by the following formula: EoR 5-24 Ripple and Noise. To noise, proceed as follows: Zout = Ein - Eo Eo =nns voltage across power supply output terminals. R =1000 Ein= 10 volts chec~ the ripple' and • a. Use test setup shown in Figure 5-<I. except connect AC voltmeter across sampling resistor instead of differential voltmeter. b. Rotate VOLTAGE controls fully cloc:kwise. c. Set METER switch to highest currei~t range and turn on supply. d. Adjust CURRENT controls until front panel meter indicates exactly the maximum rated output current. e. Turn range switch on AC voltmeter to lmV position. f. The AC voltmeter should read as f<>llows: {Readings are expressed in mVac) 6282A 628SA 6286A 6290A 6291A li296A Model 1. 0 0. 6 1. 0 Reading O.SO 0.60 0.50 g. The output impedance (Zout> should be less than 0.001 ohm. h. Using formula of step f, calculate output impedance at frequencies of lKHz, lOOKHz, and lMHz. Values should be less than 0.01 ohm, 0.2 ohm, and 2 ohms, respectively. S-21 CONSTANT CURRENT TESTS S-22 Load Regulation. To check the constant current load regulation, proceed as follows: a. Connect test setup shown in Figure 5-4. b. Turn VOLTAGE controls fully clockwise. c. Set METER switch to highest current range and turn on supply. d. Adjust CURRENT controls until front panel meter reads exacUy the maximum rated output current. e. Read and record voltage indicated on differential voltmeter. S-6 S-25 TROUBLESHOOTING S-26 Components within Hewlett-Packard power supplies are conservatively operated to provide maximum reliability. In spite of this, parts within a supply may fail: Usually the instrument must be immediately repaired with a minimum of "down time" and a systematic approach as outlined in succeeding paragraphs can greatly simplify and • speed up the repair. 5-27 TROUBLE ANALYSIS • ·a. Reference circuit check (Paragraph 5-31). This circuit provides critical operating voltages fa the supply and faults in the circuit could affect the overall operation in many ways. This circuit should be checked first, before proceeding to other areas of the unit. b. Series regulator and preregulator feedback loop checks (Paragraph 5-32). c. Procedures for dealing with common troubles (Paragraph S-33}. 5-28 General. Before attempting to trouble shoot this instrument, ensure that the fault is with the instrument and not with an associated circuit. The performance test (Paragraph 5-10) enables this to be determined without having to remove the instrument from the cabinet. 5-29 Once it is determined that the power supply is at fault, check for obvious troubles such as open fuse, a defective power cable, or an input power failure. Next, remove the top and bottom covers (each held by four retaining screws) and inspect for open connections, charred components, etc. If the trouble source cannot be detected by visual inspection, follow the detailed procedure outlined in succeeding paragraphs. Once the defective component has been located (by means of visual inspection or trouble analysis) correct it and re-conduct the performance test. If a component is replaced, refer to the repair and replacement arxi adjustment and calibration paragraphs in this section. • a. Make an ohmmeter check to be certain that neither the positive nor negative output terminal is grounded. b. Turn front-panel VOLTAGE and CURRENT controls fully clockwise (maximum). c. Turn on power supply (no load connected). d. Proceed as instructed in Table 5-2. 5-32 Series Regulator and Prerequlator Feedback Circuits. GenerallY> malfunction of these two feedback circuits is indicated by high or lQw (or no) output voltage. If one of these situations occur, disconnect the load and proceed as instructed in Table 5-3 or 5-4. Preregulator waveforms are included on the schematic at the rear of the manual. S-30 A good understanding of the principles of operation is a helpful aid in troubleshooting, and it is recommended that the reader review Section IV of the manual before attempting to troubleshoot the unit in detail. Once the principles of operation are understood, logical application of this knowledge used in conjunction with the normal voltage readings and wavefcrms shown on the schematic and the additional procedures given in the following paragraphs should suffice to isolate a fault to a compo.-ient or small group of components. The component location diagram at the rear of the manual can be consulted to determine the location of components and test points. The normal voltages shown on the schematic are positioned adjacent to the applicable test points (identified by encircled numbers on the schematic and component location diagram). Additional test procedures that will aid in isolating troubles are as follows: Table 5-2. 5-33 Common Troubles. Table 5-6 lists the symptoms, checks, and probable causes for common troubles. S-34 REPAIR AND REPLACEMENT 5-35 Before servicing a printed wiring board, refer to Figure 5-10. Section VI of this manual contains a list of replaceable parts. Before replacing a semiconductor device, refer to Table 5-7 which lists the special characteristics of selected semiconductors. If the device to be replaced is not listed in Table 5-7, the standard manufacturers part number listed in Section VI is applicable. After replacing a semiconductor device, refer to Table 5-8 for checks and adjustments that may be necessary. Reference Circuit Troubleshooting Step Meter Common Meter Positive Normal Indication 1 +S 29 9. 4 %0. 4Vdc Check 15. 4 volt bias or VR600 2 28 +S 6. 2 +O. 3Vdc Check diode VR601 30 15. 4 +o. 5Vdc Check R605, Q600 through Q603, C600, CR600 and CR601 • 3 • 5-31 Reference Circuit. +s If Indication Abnormal. Take This Action S-7 Table 5-3. Step 1 Hi9h Output Volta9e Troubles hooting Measure Respons e Voltage between TP26 and TP90 Probable Cause a. OV or negative a. 0400(04 01) shorted CR400 shorted b. More positive th-an b. 0303 open or R309 shorted Proceed to Step 2 a. OV to +O. 8V a. Open strap A3-A4 R813 or R814 open R805 or R806 shorted b. More negative than ov b. Proceed to Step 3 More positive than +l. 5V a. 01008 shorted OlOOA open b. +o. 9V to +1. 5V b. Proceed to Step 4 a. More negative than ov a. 0302 open 0301 open R30S. R300 shorted ov 2 3 4 Voltage between +s and A4 Voltage between +S and 11 Voltage between +s and 21 Table 5-4. Step 1 a. Low Output Voltage Troubles hooting Measure Voltage between TP26 and TP90 Respons e Voltage between TP90 and TP27 Proceed to Step 2 b. OV or negative b. Proceed to Step 3 a. Less positive than a. Chee le fuse Fl. If blow111 check CRS02 or CRS04 for short. If not blown, proceed to Table s-s. b. More positive than b. 0400 (0401) open Proceed to Step 3 a. Normal output voltage a. Constan t Current circuit b. Low output voltage b. If supply is furnishin g current without load, check CR809, C802, or C803 fc>r short. If it is not, proceed to Step 3 a. More negative than OV a. +sv 4 Disable Q200 by disconn ecting CR200 Voltage between +S and A4 Probable Cause a. +4V 3 I a. More positive than ov 2 • 5-8 • faulty; check 02008, R810. R809, for short. Open strap A4-AS R813, R814, C801 Proceed to Step 5 • Table 5-4. Low Output Voltage Troubleshoo ting (Continued) • Step s +s Voltage between a. and 11 b, Table S-5. Step a. QlOOB open +O. 9V to +l. SV b. QlOOA shorted Q802 or Q80l shoned Proceed to Step 6 a. Q303 shorted 0302 shorted R3 l O shorted Preregulato r/Control Circuit Troubleshoo ting Probable Cause Response Measure Waveform between 4 and 3 of T700 l Less positive than +0.9V a. OV or positive Voltage between +s and 21 6 Probable Cause Response Measure a. Normal firing pulse b. No or abnormal fir- a. b. T700 open CRSOO shorted Proceed to Step 2 ing pulse • 2 3 Waveform between 90 and 47 a. Zero or small posi- Waveform between 90 and 52 Q7 00 shorted C703 shorted Q701 open R703, primary T700 open Proceed to Step 3 b. +16 to +20 Volt level b. Q700 open c. Waveform distorted R703 shorted Q70l shoned Proceed to Step 3 c. Proceed to Step 3 a. Amplitude incorrect a. Q702 defective R707,R708, R713 incorrect value or open C700, CR710, C711 defective Period incorrect b. CR709 defective Proceed to Step 4 a. Amplitude incorrect a. CR708, CR709, R702 defective b. Period incorrect b. CR700 through CR703 b. 4 a. tive voltage Waveform between 90 and 59 CRS02-CRS04 defective R50l-RS02 open CRSOl, CR503, T800 defective defective s • Waveform between 90 and 54 R700, R701, C701 defective a. Amplitude incorrect a. b. Period incorrect b • CR704 throuqh CR707 defective 5-9 Table 5-6. Common Troubles Symptom Checks and Probable Causes a. Check operating setup for ground loops, b. If output floating, connect 1 µ.f capacitor between output and ground c. Ensure that supply is not crossing over to constant current mode under loaded condition s. d. Check for low voltage across CSOO or Q400. e. Check for excessive ripple on reference voltages. Peak-to-p eak ripple should be less than 2mV for +9. 4V and -6. 2V and less than 4mV for +15. 4V. High ripple Poor line regulation a. Poor load regulation (Constan t Voltage) a. Measurem ent technique . (Paragraph 5-16.) b. Check reference circuit (Paragraph 5-31). c. Ensure that supply is not going into current limit. Check consta.nt current input circuit. Poor load regulation (Constan t Current) b. C802, C803, and CR809 leaky, Check reference circuit (Paragraph 5-31). a. Check reference circuit (Paragraph 5-31). c. Ensure that supply is not crossing over to constant voltage operation. Check constant voltage input circuit. Oscillate s (Constant Voltage I Constant Current) a. Check C301 for open, adjustmen t of R307 (Paragraph 5-50). b. Check Rl03, ClOO or R304, C300. Poor Stability (Constan t Voltage) a. Check reference voltages (Paragrap h 5-31). b. Noisy programming resistors R813, R814. c. CR100, CRlOl leaky. d. Check Rl04, R805, R806, CS 0 l for noise or drift. e • Stage QlOO defective . .. Poor Stability (Constant Current) • a. b. c. d. e. Check reference voltages (Paragraph 5-31). Noisy programming resistors R809, R81 o. CR809, C803, C802 leaky. Check R807, R808, R200, R800, for noise or drift. Stage Q200 defective . • Table 5-7. Selected Semicond uctor Character istics Reference Designato r Character istics ~ Stock No. QlOO, Q200 Matched differenti al amplifier. NPN Si Planar. 70 (min.) hFE IC= 1 mA. VcE = 5V. Ico 0.01 µ.a @Vcbo = SV. 1854-022 9 2N2917 G. E. @ le = 4A. VcE NPN power. hFE = 35 (min); = 4V. 1854-022 5 2N3055 R. C. A. Matched differenti al amplifier. NPN Si. 1854-0221 2N4045 Union Carbide Q303. Q400 (Q401) Q851 5-10 Suggested Replacem ent • Table 5-7. • Selected Semiconductor Characteristics (Continued) CR100-CR102, CR200, CR300, CR301. CRSOO, CR700, CR701 Si diode, 200 mA. 200 prv 1901-0033 1N48SB Sylvania CR402. CR602, CR803-CR806 Si Stabistor. 200 mA. 15 prv 1901-0461 1N4828 G. E. VR300 Zener diode, 4. 22V, :!:5% 400 mw 1902-3070 1N749 Table 5-B. Checks and Adjustments After Replacement of Semiconductor Devices Function Reference • • Motorola Adjust Check 0100 Constant voltage differential amplifier Constant voltage (CV) line and load ~egu lation. 0200 Constant current differential amplifier Constant ct:trrent (CC) line and load regulation. 0300 Constant Current gating amplifier CC load regulation. Q301 Constant Voltage gating amplifier CV load regulation. 0302. 0303 Error amplifiers CV/CC load regulation Transient response 0400 (0401) Series Regulator CV/CC load regulation 0600, Q601. 0602, Q603 Reference regulator Reference ~oltages. Overvoltage trip point. 0700, Q701 0702 SCR control Voltage across series regulator R711 0851, 0852. QBS3 Meter amplifiers Meter zero. Voltmeter/ Ammeter tracking R870,RB65, RBSS QBOl, QB02 Overcurrent detectors Short output, ensure that output goes to zero without damage to series regulator. CRlOO, CRlOl Limiting diodes CV load regulation CR403, CR404 Forward bias regulator Voltage across each diode O. 6 to O. 9 volts. CR700-CR703 Rectifier bridge Waveform between 52 and 90 CR704-CR707 Rectifier bridge Waveform and 90 5-11 b~tween 54 R307 R604 Excessiv e heat or pressure can lift the copper strip from the board. Avoid damage by using a low power soldering iron ( 50 watts maximum) and following these instructio ns. Copper that lifts off the board should be cemented in place with a qUick drying acetate base cement bavtng good electrica l insulating propertie s. A break in the copper should be repaired by soldering a short length of tinned copper wire across the break. • Use only high quality rosin core solder when repairing etched circuit boards. NEVER USE PASTE FLUX. After soldering , clean off any excess flux and coat the repaired area With a high quality electrica l varnish or lacquer. When replacing components with multJple mowiting pins such as tube sockets, electroly tic capacitors, and potentiom eters, it Will be necessary to lift each pin slightly, working around the components several times unW it is free. WARNING : If the specific instructio ns outlined in the steps below regarding etched circUit boards wlthout eyelets are not followed, extensive damage to the etched circuit board will result. 1. Apply heat sparingly to lead of component to be replaced. If lead of component passes through an eyelet in the circuit ~- · .·· board, apply heat on com- ~ ponent side ,.,,-~~~;__, of board. If I. lead of com-\:; ponent does not pass --uirough an eyelet, apply beat to conductor side of board. 2. Reheat solder in vacant eyeletand quickly insert a small awl to cleaninsi de of hole. If hole does not bavi"iii eyelet, insert awl or a 157 drill from conductor side _ _ _ _ _ _ _....., of board. 4. Boldpart againstbo ard(avoid overheati ng) 3. Bend clean tinned lead on new part and and solder leads. Apply heat to companent leads on correct side af board as explained in step 1. carefully insert through eye lets or holes in board. C'''''''''''Up;Q!Q ~ • In the event that either the circuit board has been damagedorthe conventional methodis impractical, use method shown below. This is especially applicable for circuit boards without eyelets. 1•. Clip lead as shown below. 2. Bend prcitrudlng leads upward. Bend lead of new APPLY component SOLDER around protruding lead. Apply solder using a pair of long nose pliers as a heat sink. This procedur e is used in the field only as an alternate m•?ans of repair. It is not used within the factory. Figure 5-10. Servicing Printed Wiring Boaf'!is S-12 •• Table 5-8. Checks and Adjustments After Replacement of Semiconductor Devices (Continued) • CR600, CR601, CRBOO, CRBOl, CRS01-CRS04 Rectifier diodes .Voltage across appropriate filter capacitor VR600, VR601 Reference voltages Check +9. 4V and -6. 2V reference voltages Table 5-9. Calibration Adjustment Summary Adjustment or Calibration • Paragraph Meter Zero 5-38 Pointer Voltmeter Tracking 5-40 R870 and R865 Ammeter Trac king 5-42 R855 •voltage" Programming Current S-44 .R806 •current" Programming Current 5-46 R808 Overvoltage Trip 5·48 R604 Transient Response s-so R307 Preregulator Tracking 5-52 R7ll S-36 ADJUSTMENT AND CALIBRATION S-37 Adjustment and calibration may be req\lired after performance testing, troubleshooting, or repair and replacement. Perform only those adjustments that affect the operation of the faulty circuit and no others. Table S-9 summarizes the adjustments arid calibrations contained in the following paraqraphs. 5-38 METER ZERO S-39 Proceed as follows to zero meter: a. Tum off instrument (after it has reached normal operating temperature) and allow 30 seconds for all capacitors to discharge. b. Insert sharp pointed object (pen point or awl) into the small indentation near top of round black plastic disc located directly below meter face. c. Rotate plastic disc clockwise (cw) until meter reads zero, then rotate ccw slightly in order to free adjustment screw from meter suspension. If pointer moves, repeat steps band c. • Control Device 5-40 VOLTMETER TRACKING S-41 l'o calibrate voltmeter tracking, p-oceed as follows: S-13 a. To electrically zero meter, set METER sWitch to highest current position and, With supply off and no load connected, adjust R870 until front panel meter reads zero. b. Connect differential voltmeter across supply, obs Erving correct polarity. c. Set METER switch to highest voltage range and turn on supply. Adjust VOLTAGE control until differential voltmeter reads exactly the maximum rated output voltage. d. Adjust R865 until front panel meter also indicates maximum rated output voltage. S-42 AMMETER TRACKING 5-43 To calibrate ammeter tracking, proceed as follows: a. Zero meter as described in step a of 5-41. Connect test setup shown on Figure 5-4 leaving switch Sl open. b. Turn VOLTAGE control fully clockwise and set METER switch to hiqhest current range. c. Turn on supply and adjust CURRENT controls until differential voltmeter reads 1. OVdc. d. Adjust R855 until front panel meter indicates exactly the maximum rated output current. 5-44 CONSTANT VOLTAGE PROGRAMMING CURRENT 5-45 To calibrate the constant voltage programming current, proceed as follows: a. Connect a 0. l % , 20 watt resistor between terminals -S and A4 on rear barrier strip. Resistor value to be as follows: Model 6282A 6285A 6286A .6290A 6291A 6296A Res. 2K 4K 4K SK BK l 8K b. Disconnect jumper between A3 and A4 on rear terminal barrier strip. c. Connect a decade resistance in place of R806. d. Connect a differential voltmeter between +S and -S and turn on supply. e. Adjust decade resistance box so that differential voltmeter indicates maximum rated output voltage within the following tolerances: Model 6282A 6285A 6286A 6290A 6291A 6296A Tol.(Vdc) :0.2 ::i:0.4 ::t.:0.4 ::t.:0.8 :0.8 ::i:l.2 f. Replace decade resistance with resistor of appropriate value in R806 position. 5-46 CONSTANT CURRENT PROGRAMMING CURRENT 5-47 To calibrate the constant current programming current, proceed as follows: a. Connect power supply as shown in Fig. 5-4. b. Remove strap between A6 and A7 (leaving A7 and AS jumpered). c. Connect a O. 1 % , 1/2 watt resistor between Al and A7. Resistor value is l!V. (1. SKt. for Models 6290A and 6296A). d. Connect decade resistance box in place of R808. e. Set METER switch to highest current range and turn on supply. f. Adjust the decade resistance so that the differential voltmeter indicates 1. 0 ::1: O. 02Vdc. g. Replace decade resistance with appropriate value resistor in R808 position. 5-48 OVERVOLtAGE TRIP 5-49 To adjust the overvoltage trip point, proceed as follows: a. Connect differential voltmeter acres s +S and -S terminals of supply. b. Rotate VOLTAGE controls fully clockwise. c. Turn on unit. Differential voltmeter should read 20% above maximum rated output voltage within :!:5%. d. If it does not, turn off supply and connect decade resistance across R60S in place of R604. e. Adjust decade resistance until differential voltmeter reads that indicated in step c. NOTE The +15.4V reference voltage must be kept within ::i:0.5Vdc when adjusting the decade resistance box. 5-14 f. Replace decade resistance With r•esistor of appropriate value in R604 position. 5-50 TRANSIENT RECOVERY TIME S-51 To adjust the transient response, proceed a . follows: a. Connect test setup as shown in Figure 5-7. b. Repeat steps a through e as outlined in Paragraph 5-19. c. Adjust R307 so that the transient response is as shown in Figure 5-8. 5-52 PREREGULATOR TRACKING (60Hz OPERATION) 5-53 To adjust the preregulator control circ:uit with a 60Hz ac input, proceed as follows: a. Connect proper load resistor acroiss output terminals of supply. Resistance value 1to be as follows: MQQfil. 6282A 6285A 6286A 6290A 6291A 6296A Res. l.n. 4n. 2.n. l 3n. 8.n. 2o.,.. b. Connect DC voltmeter between TP27 and TP90 (across series regulator). c. Turn on supply and adjust VOLTAGIE controls for maximum rated output voltage. d. Adjust i71 l so that DC voltmeter reads 3 ::i: O. 2Vdc. 5-54 PREREGUIATOR TRACKING (SOHz OPERATION) 5-55 To adjust the preregulatorcontrol circuitwhe.n the ac input is from a SOHz source, proceed as follows: a. Connect load resistor across rear output terminal of supply. Resistor value to be as follows: Model 6282A 6285A 6286A 6290A 6291A 6296A Res. l.n. 4n 2.n. l 3n. Sn 20.n. b. Connect o.scilloscope (de coupled) across series regulator, T. P. 27 to T. P. 90. c. Disconnect R709 in the SCR control circuit, and connect decade resistance box in its place. d. Rotate CURRENT controls fully clockwise and turn on supply. e. Decrease resistance of decade resistance from normal value of R709 until sawtooth waveform on oscilloscope is symmetrical (amplitude of SOH-z sawtooth waves are equal). f. Replace decade resistance box with appropriate value resistor in R709 position. g. Adjust ramp potentiometer R711 for 3.SVdc drop across series regulator. h. If 3.S volts cannot be obtained, remove R712 (in series with R711) and connect the decade resistance box in its place. i. Increase value of decade resistance box from normal value of R712 until 3.SVdc drop is obtained across series regulator. j. Remove decade resistance and con.nect new resistance value in R712 position. • • • SECTION VI REPLACEABLE PARTS 6·1 Table 6-l. INTRODUCTION 6-2 This section contains information for ordering replacemen t parts. Table 6-4 lists parts in alphanumeric order by reference designators and provides the following information : a. Reference Designators . Refer to Table 6-l. b. Description . Refer to Table 6-2 for abbreviations . c. Total Quantity (TQ). Given only the first part number is listed except in instruments the time containing many sub-modula r assemblies, in which case the TQ appears the first time the part number is listed in each assembly. d. Manufactur er's Part Number or Type. e. Manufactur er's Federal Supply Code Number. Refer to Table 6-3 for manufacture r's name and address. f. Hewlett-Pa ckard Part Number. g. Recommend ed Spare Parts Quantity (RS) for complete maintenanc e of one instrument during one year of isolated service. h. Parts not identified by a reference designator are listed at the end of Table 6·4 under Mechanical and/or Miscellaneo us. The former consists of parts belonging to and grouped by individual assemblies: the latter consists of all parts not immediately associated with an assembly. 6-3 ORDERING INFORMATION 6-4 To order a replacemen t part, address order or inquiry to your local Hewlett-Pac kard sales office (see lists at rear of this manual for addresses). Specify the ·following information for each part: Model, complete serial number, and any Option or special modificatio n cJ) numbers of the instrument; Hewlett-Pac kard part number: circuit reference designator; and description . To order a part not listed in Table 6-4, give a complete description of the part, its function, and its location. Table 6-l. A B c CB • CR DS Reference Designators =assembly = blower (fan) =capacitor = circuit breaker = diode = device, signaling (lamp) E F J K L M = miscellaneo us electronic part = fuse = Jack, Jumper = relay = inductor = meter 6-l p Q R s T TB TS Reference Designators (Continued) =plug = transistor =resistor =switch = transformer = terminal block = thermal switch Table 6-2. = VR X Z = vacuum tube, neon bulb, photocell, etc. = zener diode = socket = integrated circuit or network Description Abbreviatio ns =ampere = alternating current assy, assembly =board bd bkt = bracket cc =degree Centigrade cd =card coef = c.oefficient comp = compositio n CRT = cathode-ra y tube = center-tapp ed CT = direct current de DPDT = double pole, double throw DPST = double pole. single throw elect = electrolytic encap = encapsulat ed =farad F or =degree Farenheit fxd =fixed =germanium Ge =Henry H Hz =Hertz = integrated IC circuit = inside diameter ID incnd = incandesce nt = kilo= io3 k = mllli = io-3 m =mega= io6 M = micro = io-6 11 met. =metal A ac V mfr = manufact.ire r mod, = modular or modified mtg =mounting = nano= io-9 n normally closed NC NO = normally open = nicke 1-plated NP =ohm r>. obd =order by description OD =outside diameter = pico= io-12 p P.C. = printed circuit pot. = potentiomet er p-p = peak-to-pea k ppm = parts per million pvr = peak reverse voltage rect = rectifier nns =root mean square = silicon Si SPDT = single pole, double throw SPST = single pole, single throw = small signal SS = slow-blow T tan. = tantulum = titanium Ti =volt v var = variable = wirewound WW w =Watt = Table 6-3. CODE NO. MANUFACTURER Code List of Manufa cturers CODE NO. ADDRESS 00629 EBY Sales Co. , ·Inc. Jamaic a, N. Y. 00656 Aerovox Corp. New Bedford, Mass. 00853 Sangam o Electri c Co. s. Carolin a Div. Picken s, S. C. 01121 Allen Bradley Co. Milwau kee, Wis. 01255 Litton Industr ies, Inc. 01281 01295 01686 01930 02107 02114 02606 02660 02735 03508 03797 03877 03888 04009 04072 04213 04404 04713 05277 05347 05820 06001 06004 06486 06540 06555 06666 06751 06776 06812 07137 MANUFACTURER ADDRESS 07138 Westin ghouse Electric Corp. Electro nic Tube Div. Elmira, :~. Y. Fairchi ld Camera and Instrum ent Corp. Semico nductor Div. Mounta in View, Calif. 07387 Birtche r Corp-..The Los Angele s, Calif. 07397 Sylvan ia Electric Prod. Inc. Sylvan ia Electro nic System s Wester n Div. Mounta in View, Calif. 07716 IRC Div. of TRW Inc. Burlington Plant Burlington, lowa 07910 Contin ental Device Corp. Hawtho rne, C<slif. 07933 Raytheon Co. Compo nents Div. Semico nductor Operati on Mounta in View, C1tl1f. 08484 Breeze Corpor ations, Inc. Union, N. J. 08530 Relianc e Mica Corp. Brookly n, N. Y. 08717 Sloan Company, The Sun Valley, C;iW. 08730 Vemaline Produc ts Co. Inc. Wyckoff, N'. J. 08806 Genera l Elect. Co. Miniature Lamp Dept. Clevela nd, C>hio 08863 Nyloma tic Corp. Norrisv ille, Pa. 08919 RCH Supply Co. Vernon, Ce1lif. 09021 Airco Speer Electro nic Compo nents Bradford, Pa. 09182 *Hewle tt-Pack ard Co. New Jersey Div. Rockaway, !ii. J. 09213 Genera l Elect. Co. Semico nductor Prod. Dept. Buffalo, N. Y. 09214 Genera l Elect. Co. Semico nductor Prod. Dept. Auburn, N. Y. 09353 C & K Compo nents Inc. Newton, Mass. 09922 Bumdy Corp. Norwalk, Conn. 11115 Wa911er Electri c Corp. Tung-S ol Div. Bloomfield, N'. J. 11236 CTS of Berne, Inc. · Berne, Ind. 11237 Chicag o Teleph one of Cal. Inc. So. Pasade na, Calif. 11502 IRC Dlv. of TRW Inc. Boone Plant Boonf!, N. C. 11711 Genera l Instrum ent Corp Rectifi er Div. Newark, N.J. 12136 Philade lphia Handle Co. Inc. Camden , N.J. 12615 U.S. Termin als, Inc. Cincin nati, Ohio 12617 Hamlin Inc. Lake Mills, Wiscon sin 12697 Claros tat Mfq. Co. Inc. Dover, N. H. 13103 Therma lloy Co. Dallas, Texas 14493 *Hewle tt-Pack ard Co. Loveland Div. Loveland, Col.o. 14655 Comel l-Dubi lier Electro nics Div. Federa l Pacific Electric Co. Newark, N. J. 14936 Genera l Instrum ent Corp. Semico nductor Prod. Group Hicksv ille, N. Y. 15801 Fenwal Elect. Framingham, Mass • 16299 Comin g Glass Works, Electro nic Compo nents Div. Raleigh, N. C. 07263 Beverly HUls, Calif. TRW Semico nducto rs, Inc. Lawnd ale, Calif. Texas Instrum ents, Inc. Semico nducto r-Comp onents Div. Dallas , Texas RCL Electro nics, Inc. Manch ester, N. H. Amerock Corp. Rockfo rd, Ill. Sparta Mfg. Co. Dover, Ohio Ferroxc ube Corp. Sauger ties, N. Y. Fenwal Labora tories Morton Grove, Ill. Amphenol Corp. Broadv iew, Ill. Radio Corp. of Americ a, Solid State and Receiv ing Tube Div. Somerv ille, N.J. G. E. Semico nducto r Produc ts Dept. Syracu se, N. Y. Eldema Corp. Compto n, Calif. Transit ron Electronic:. Corp. Wakef ield, Mass. Pyrofilm Resisto r Co. Inc. Cedar Knolls, N. J. Arrow, Hart and Hegem an Electri c Co. Hartfor d, Conn. ADC Electro nics, Inc. Harbor City, Calif. Cadde 11 & Bums Mfg. Co. Inc. Mineol a, N. Y. *Hewl ett-Pac kard Co. Palo Alto Div. Palo Alto, Calif. Motoro la Semico nducto r Prod. Inc. Phoeni x, Art.zona Westin ghouse Electri c Corp. Semico nducto r Dept. Youngwood, Pa. t1ltroni x, Inc. Grand Junctio n, Colo. Wakefi eld EnQr. Inc. Wakef ield, Mass. Genera l Elect. Co. Electro nic Capacito~ & Battery Dept. Irmo, S. C. Bassik Div. Stewar t-Warn er Corp. Bridgep ort, Conn. IRC Div. of TRW Inc. Semico nducto r Plant Lynn, Mass. Amatom Electro nic Hardwa re Co. Inc. New Rochel le, N. Y. Beede Electri cal Instrum ent Co. Penaco ok, N. H. Genera l Device s Co. Inc. Indian apolis, Ind. Semcor Div. Compo nents, Inc. Phoeni x, Arizon a Robinson Nugent , Inc. New Albany , Ind. Torrington Mfg. Co., West Div. Van Nuys, Calif. Transis tor Electro nics Corp. Minne apolis, Minn. *Use Code 28480 assign ed to Hewlet t-Packa rd Co., Palo Alto, Califor nia 6-2 • • • Table 6-3, Code List of Manufacturers (Continued) • CODE NO. 16758 17545 17803 17870 18324 19315 19701 21520 22229 22753 23936 24446 24455 24655 24681 • 26982 27014 28480 28520 28875 31514 31827 33173 35434 37942 42190 43334 44655 46384 47904 49956 55026 56289 58474 58849 • 59730 61637 63743 MANUFACTURER CODE NO. ADDRESS MANUFACTURER ADDRESS 70563 Amperite Co. Inc. Union City, N. J. 70901 Beemer Engrq, Co. Fort Washington, Pa. 70903 Belden Corp. Chicago, Ill. Wllloughby, Ohio 71218 Bud Radio, Inc, 71279 Cambridge Thermionic Corp. Cambridge, Mass. 71400 Bussmann Mfg. Div. of McGraw & Edison Co. St. Louis, Mo. 71450 CTS Corp. Elkhart, Ind. 71468 LT. T. Cannon Electric Inc. Los Angeles. caw. 71590 Globe-Union Inc. Milwaukee, Wis. Centralab Div. 71700 General Cable Corp. Comish Williamstown, Mass. Wire Co, Div, Providence, R. I. 717 07 Coto Coil Co, Inc. 71744 Chicago Miniature Lamp Works Chicago, Ill. 717 85 Cinch Mfg. Co. and Howard Chicago, Ill. B. Jones Div. Midland, Mich. 71984 Dow Coming Corp. 72136 Electro Motive Mfg, Co, Inc. Willimantic, Conn. Brooklyn, N. Y. 72619 Dialight Corp. Newark, N. J, 72699 General Instrument Corp. Harwood Heights, Ill. 7 27 65 Drake Mfg. Co. 72962 Elastic Stop Nut Div. of Union, N. J, Amerace Esna Corp. 72982 Erie Technological Products Inc. Erie, Pa, Hartford, Conn. 7 3096 Hart Mfg. Co. 73138 Beckman Instruments Inc. Fullerton, Calif. Helipot Div, Ashland, Mass. 73168 Fenwal, Inc. 73293 Hughes Aircraft Co. Electron Torrance, Calif. Dynamics Div. 73445 Amperex Electronic Corp. Hicksville, N. Y. 73506 Bradley Semiconductor Corp, New Haven, Conn. Hartford, Conn. 73559 Carling Electric, Inc, 73734 Federal Screw Products, Inc. Chicago, Ill. Trenton, N. J. 74193 Heinemann Electric Co, Bridgeport, Conn. 74545 Hubbell Harvey Inc. 74868 Amphenol Corp. Amphenol RF Div. Danbury, Conn. Waseca, Minn, 74970 E. F. Johnson Co. Philadelphia, Pa. 75042 IRC Div. of TRW, Inc. 75183 *Howard B. Jones Div. of Cinch New York, N. Y. Mfg, Corp, Dayton, Ohio 75376 Kurz and Kasch, Inc. Mt. Vernon, N. Y. 75382 Kilka Electric Corp. Des Plaines, Ill. 75915 Uttlefuse, Inc. 76381 Minnesota· Mining and Mfg. Co. St. Paul, Minn. Bloomfield, N. J, 76385 Minor Rubber Co. Inc. 76487 James Millen Mfg, Co. Inc. Malden, Mass. Compton, Calif, 76493 J. W, Miiier Co. Delco Radio Div. of General Motors Corp, Kokomo, Ind. Atlantic Semiconductors, Inc. Asbury Park, N. J. Fairchild Camera and Instrument Corp Semiconductor Div, Transducer Plant Mountain View, Calif. Daven Div. Thomas A. Edison Industries Orange, N. J. McGraw-Edison Co. Sunnyvale, Calif. Signetics Corp. Bendix Corp. The Navigation and Teterboro, N. J. Control Div. Electra/Midland Corp. Mineral Wells, Texas Fans tee l Meta llurgica 1 Corp. No, Chicago, IlL Union Carbide Corp. Electronics Div, Mountain View, Calif. Hollywood, Fla. UID Electronics Corp. Pampa, Texas Pamotor, Inc, Schenectady, N. Y. General Electric Co. General Electric Co. Lamp Div. of Consumer Prod, Group Nela Park, Cleveland, Ohio General Radio Co. West Concord, Mass. LTV Electrosystems Inc Memcor/ComHuntington, Ind. ponents Operations Dynacool Mfg, Co. Inc. Saugerties, N. Y. National Semiconductor Corp. Santa Clara, Calif. Hewlett-Packard Co, Palo Alto, Calif. Kenilworth, N. J, Heyman Mf;. Co. IMC Magnetics Corp. New Hampshire Div, Rochester, N. H. SAE Advance Packaging, Inc. Santa Ana, Calif. Budwig Mfg, Co. Ramona, Calif. Owensboro, Ky. G. E. Co. Tube Dept. Chicago, Ill. Lectrohm, Inc. P, R. Mallory & Co. Ille. Indianapolis, Ind. Chicago, Ill Muter Co. New Departure-Hyatt Bearings Div. Sandusky, Ohio General Motors Corp. Skokie, IlL Ohmite Manufacturing Co. Penn Engr. and Mfg, Corp. Doylestown, Pa. Cambridge, Mass, Polaroid Corp, Lexington, Mass. Raytheon Co. -Simpson Electric Co. Div, of American Chicago, Ill. Gage and Machiae Co. Sprague Electric Co. North Adams, Mass, Bristol, Conn, Superior Electric Co, Syntron Div. of FMC Corp. Homer City, Pa. Thomas and Betts Co. Philadelphia, Pa. Union Carbide Corp. New York, N. Y, Ward Leonard Electric Co. Mt. Vernon, N. Y. *Use Code 71785 assigned to Cinch Mfg. Co., Chicago, Ill. 6-3 Table 6-3. Code List of Manufa cturers (Contin ued) CODE NO. MANUFACTURER CODE NO. ADDRESS 76530 76854 Cinch City of Industr v, Calif. Oak Mfg. Co. Div. of Oak Electro iNetics Corp. Crysta l Lake, Ill. 77068 Bendix Corp., Electro dynami cs Div. No. Hollyw ood, Calif. 77122 Palnut Co. Mounta inside, N. J. 77147 Patton- MacGu yer Co. Provide nce, R. L 77221 Phaostr on Instrum ent and Electro nic Co. South Pasade na, Calif. 77252 Philade lphia Steel and Wire Corp. Philade lphia, Pa. 77342 American Machin e and Foundr y Co. Potter and Brumfield Div. Princet on, Ind. 77630 TRW Electro nic Compo nents Div. Camde n, N. J. 77764 Resista nce Produc ts Co. Harrisb urg, Pa. 78189 Illinois Tool Works Inc. Shakep roof Div. Elgin, Ill. 78452 Everloc k Chicag o, Inc. Chicag o, Ill. 78488 Stackpo le Carbon Co. St. Marys, Pa. 78526 Stanwy ck Windin g Div. San Fernan do Electric Mfg. Co. Inc. Newbu rgh, N. Y. 78553 Tinnen nan Produc ts, Inc. Clevel and, Ohio 78584 Stewar t Stampi ng Corp. Yonker s. N. Y. 79136 Waldes Kohinoor, Inc. L: I. C., N. Y. 79307 Whiteh ead Metals Inc. New York. N. Y. 79727 Contin ental-W irt Electro nics Corp. Philade lphia, Pa. 79963 Zierick Mfg. Co. Mt. Kisco, N. Y. 80031 Mepco Div, of Sessio ns Clock Co. Morris town, N. J. 80294 Bourns, Inc. Riversi de, Calif. 81042 Howard Industr ies Div. of Msl Ind. Inc. Racine , Wisc. 81073 Graybi ll, Inc. La Grange , Ill 81483 Interna tional Rectifi er Corp. El Segund o, Calif. 81751 Columb us Electro nics Corp. Yonker s, N. Y: 82099 Goodye ar Sundrie s & Mecha nical Co. Inc. New York, N. Y. 82142 Airco Speer Electro nic Compo nents Du Bois, Pa. 82219 Sylvan ia Electric Produc ts Inc. Ele.ctronic Tube Div. Receiv ing Tube Operat ions Emporium, Pa. 82389 Switch craft, Inc, Chicag o, Ill. 82647 Metals and Contro ls Inc. Contro l Product s Group Attlebo ro, Mass. 82866 Researc h Produc ts Corp. Madiso n, Wis. 82877 Rotron Inc. Woods tock, N. Y. 82893 Vector Electro nic Co. Glenda le, Calif. 83058 Carr Fastene r Co. ·Camb ridge, Mass. 83186 Victory Engine ering Corp. Springf ield, N. J. 83298 Bendix Corp. Electric Power Div. Eatonto wn, N. J. 83330 Herman H. Smith, Inc. Brooklyn, N. Y. 83385 Centra l Screw Co. Chicag o, Ill. 83501 Gavitt Wire and Cable Div. of Amerace Esna Corp, Brookf ield, Mass. 83508 MANUFACTURER ADDRESS Grant Pulley and Hardwa re Co, West Nyack, N. Y. 83594 Burrou ghs Corp. Electro nic Compo nents Div. Plainfie ld, N. J. 83835 U. S, Radium Corp. Morrist own, N. J. 83877 Yarden y Labora tories, Inc. New York, N. Y. 84171 Arco Electro nics, Inc, Great Neck, N. Y. 84411 TRW Capaci tor Div. Ogallal a, Neb. 86684 RCA Corp. Electro nic Compo nents Harriso n, N'. J. 86838 Rummel Fibre Co. Newark, N.J. 87034 Marco & Oak Industr ies a Div. of Oak Electro /netics Corp. Anaheim; Calif. 87216 Philco Corp, Lansda le Div, Lansda le, :Pa. 87585 Stockw ell Rubber Co. Inc. Philade lphia, Pa. 87929 Tower- Olscha n Corp, Bridgeport, Conn. 88140 Cutler- Hamm er Inc. Power Distrib ution and Contro l Div. Lincoln Plant Lincoln, Ill. 88245 Litton .Precis ion Produc ts Inc, USECO Div. Litton Industr ies Van Nuys, Calif. 90634 Gulton Industr ies Inc. Metuch en, N. J. 90763 United -Car Inc. Chicag o, Ill. 91345 Miller Dial and Namep late Co. El Monte, Calif. 91418 Radio Materi als Co. Chicag o, Ill. 91506 Augat, Inc. Attlebo ro, Mass, 91637 Dale Electro nics, Inc. Columb us, Neb. 91662 Elco Corp. Willow Grove, Pa. 91929 Honeyw ell Inc. Div. Micro Switch Freepor t, IU. 92825 Whitso , Inc. Schille r Pk. , Il.l. 93332 Sylvan ia Electri c Prod. Inc. Semiconduc tor Prod. Div, Wobum , Mass, 93410 Es sex Wire Corp. Stemco Contro ls Div. Mansfi eld, Oh:lo 94144 Raythe on Co. Compo nents Div. Ind. Compo nents Oper. Quincy , Mau. 94l54 Wagne r Electri c Corp, Tung-S ol Div. Livings ton, N. r. 94222 Southc o Inc. Lester, Pa. 95263 Leecra ft Mfg. Co. Inc. L. I. C., N. Y. 95354 Method e Mfg. Co, Rolling Meadow s, Ill. 95712 Bendix Corp. Microw ave DeVice s Div. Franklin, Ind. 95987 Wecke sser Co, Inc. Chicag o, Ill. 96791 Amphe nol Corp, Amphenol Contro ls Div, Janesv ille, Wl!i, 97464 Industr ial Retaini ng Ring Co. Irvingto n, N. J. 97702 IMC Magne tics Corp, Eastern Div. Westbu ry, N. Y. 98291 Sealec tro Corp. Mamar oneck, N, Y, 98410 ETC Inc. Clevela nd, Ohil:> 98978 Interna tional Electro nic Resear ch Corp. Burbank, Calif. 99934 Renbra ndt, Inc. Boston, Mass. 6-4 • • • Refe.rence Designato r • • • ClOO C200 C300 C302, 301, 303 csoo CSOl C600 C601, 602, 702. 801 C700 C701 C703 0000 C802 C803 0804 C805 C900 Descriptio n fxd. fxd, fxd, fxd, fxd, fxd. fxd, film o. Q82µf 2oov film 0.0047!J.f 200V film 0.22µf 80V film 0.0022µ.f 200V elect 10, OOOµf 75V paper O.lid 400V elect 325µ.f 35V fxd, elect 5µ£ 65V fxd, elect lµf 35V fxd, elect lid SOV fxd, film O,lµf 200V fxd, elect 1500µ.f 40V fxd, elect 10µ£ lOOV fxd, elect 1600µ£ 70V NOT ASSIGNED fxd, elect 4. 7µ.f 35V fxd, elect 20µf 50V CRl00-10 2, 200, 300, 301. 500, 700-711, 802. 807. 808, 900, Si. diode 200ma 200prv 901 CR400, 501, 503, Si. rect 3A@7soc 200prv 809 CR401, 403, 404, 600,601,8 00, .Si. rect 500ma 200prv 801, 902, CR402, 602, 803, 804.805.8 06 Si. diode 200ma 15prv SCR 8 amp 200prv CR502, 504 Mfr. Part 4t or Type Mfr. Mfr. Code ~ Stock No. RS 192P8239 2 192P47292 192P2249R8 192P2229 2 D39062 160Pl0494 034656 Sprague Sprague Sprague Sprague HI.AB Sprague HI.AB 56289 56289 56289 56289 09182 56289 09182 0160-0167 0160-0157 0160-2453 0160-0154 0180-1924 0160-0013 0180-0332 1 1 1 1 1 l HI.AB 033689 4 1500105X903SA2 Sprague 1 30Dl05G050BA4 Sprague l Sprague 192Pl0492 1 HI.AB 038733 1 1 30Dl06Gl 00DC2Ml Sprague HIAB 041655 1 09182 56289 56289 56289 09182 56289 09182 0180-1836 0180-0291 0180-0108 0160-0168 0180-1894 0180-0091 0180-1895 1 l 1 1 1 1 1 150D475X9035B2 Sprague 30D206GOSODC4 Sprague 56289 56289 0180-0100 1 0180-0049 1 HI.AB 09182 1901-0033 9 Quantity 1 1 l 3 l l 1 1 l 24 l 4 MR1032B Motorola 04713 1901-0416 4 8 1N3253 · R.C.A. 02735 1901-0389 6 6 2 HI.AB 2N3669 R. C.A. 09182 02735 1901-0461 6 1884-0019 2 312005 Littlefuse 75915 2110-0010 5 HI.AB 09182 1854-0229 2 Fl Fuse cartridge SA 1 Ql00,200 Q300. 301. 601. 602.603 Q302, 700, 701, 801.802 0303,400 0401 Q600 0702. 800, 850, 852,853 0851 0854 Si. NPN diff. amp, 2 Si. NPN 5 4JX16Al014 G.E. 03508 1854-0071 5 ·Si. NPN Si. ~PN power 5 2 2N3417 G.E. HLA.B 03508 09182 185 4-0087 5 1854-0225 2 Si. PNP 1 40362 R.C.A. . 02735 185 3-0041 1 Sl. PNP Si. NPN diff. amp, NOT ASSIGNED 5 1 2N2907A Sprague HI.AB 56289 09182 1853-0099 5 1854-0221 1 Type CEA T-0 Type CEA T-0 Type CEA T-0 EB-1025 242E-4915 Type CEA T-0 Type CEA T-0 Type CEA T-0 I. R. C. I. R. C. I. R. C. A.B. Sprague. I. R.C. I. R. C. 07716 07716 07716 01121 56289 07716 07716 07716 0698-5092 0757-0460 0757-0480 0686-1025 0811-1801 0698-5089 0757-0427 0757-0457 Rl00,202, 819 RlOl. 201. 820 Rl02,108. 204 R103,306 ,815 Rl04 RlOS.206 Rl06.200. 203 Rl07, 205 'NOT USED fxd, fxd, fxd, fxd. fxd, fxd, · fxd, fxd, met. film 160Kn.:U% l/8w 3 met. film 61. 9Kn.:1:l % l/Bw 3 met. film 432Kn.:1:l % l/Bw 3 3 comp lKn. :1:5% !w ww 490.n ~5% 3w 20ppm 1 met. film 33. OKn. :1:1 % l/Bw 2 met. film 1.5Kn:t:l% Vaw 3 met. film 47.SKn.:1:1% VBw 2 6296A 6-S I. R. c. 1 1 1 1 l 1 l l Referen ce Designa tor R300 R301 ·R302, 303 R304 R305 R307 R308 R309 R310 R311 R312.8 11.812 R313 R400 R401 R500 R501,50 2 R503 R600 R601 R602.87 1 R603 R604,8 06.808 R605, 608. 609. 610 R606 R607 R611 R700 R701 R702 R703,70 7 R704 R705 R706 R708 R709 R710 R711 R712 R713 R800 R805 R807 R809.81 0 R813,81 4 R816 R817 R818 R821 R822 R823 R824 R825 R826 R827 Descrte tion Mfr. Part# or Tm Quan tit~ fxd. comp 330Kn. :i:S% !w bed. comp 39.n. :i:5% tw fxd. comp 36Kn. :i:S% !w fxd. comp 75.n. :1:5% !w fxd. comp 6. 2Kn. :1:5% !w var. ww lOKn. fxd. comp 3Kn. :i:5% tw fxd, comp 150.n. :i:5% 40w fxd. comp 47Kn. :1:5% iw fxd. WW 6.8.n. :i:5% fxd. ww 100.n. :1:5% }w fxd. ww lOKn. :t::5% tw Strap LEAVE OPEN fxd. WW 800.n. :1:5% 10w fxd. comp 47.n. :1:5% iw fxd, comp 820,... :1:5% jw fxd, comp lOOKn. :i:5% jw fxd, met. film !Kn. :1:1 % tw fxd. met. film 1. 33Kn. :t:l % fxd, met. film 2Kn. :t:l % fxd. comp SELECTIVE :t:5% }w Mfr, Mfr. Code Stock No, RS 1 1 2 1 1 1 1 1 l 1 3 l 1 EB-3345 EB-3905 EB-3635 EB-7505 EB-6225 Series 70 EB-3025 405/817 MTG EB-4735 Type BWH EB-1015 .EB-1035 A.B. A.B. A.B. A.B. A.B. C. T.S. A.B. W.L. A.B. I. R. C. A.B. A. B. 01121 01121 01121 01121 01121 71450 01121 63743 01121 07116 01121 01121 0686-33 45 0686-39 05 0686-36 35 0686-75 05 0686-62 25 2100-00 92 0686-30 25 0811-19 24 0686-47 35 0811-16 76 0686-10 15 0686-10 35 1 1 1 1 1 1 1 l 1 1 l l 1 2 1 1 1 2 1 3 lOXM EB-4705 EB-8215 EB-1045 Type CEB T-0 Type CEB T-0 Type CEB T-0 Type EB W. L. A.B. A.B. A. B. I. R. C. I.R.C. I. R. C. A.B. 63743 01121 01121 01121 07716 07716 07716 01121 0811-09 44 0686-47 05 0686-82 15 0686-10 45 0757-03 38 0698-31 34 0757-07 39 l 1 1 1 1 fxd. met. film 6.2K.n. :t:l% tw 4 fxd, met. film 9.31Kn.:1:1%tw l fxd. met. film 560µ :1:1 % tw 1 bed, WW 390.n. :1:5% 3w 1 fxd. met. ox 270.n. :t::5% 2w 1 fxd, comp 24n. :1:5% jw l fxd, WW 2.4K.n. :1:5% 3w 1 fxd. comp 3.9Kn. :t::5% !w 2 fxd. comp 9.lKn. :1:5% tw l fxd, comp llOKn. :1:5% iw l fxd, comp 4.7.n. :t5% lw l fxd. comp 4. 3Kn. :1:5% !w 1 fxd. comp 8. 2Kn. :1:5% -fw l fxd, comp 1.lM.n. :i:5% !w 1 var. ww SK.n. 1 fxd. comp 12Kn. ±5% !w 1 fxd, comp 270Kn. :i:5% !w l fxd, WW 0. 33.n. ±5% 40w 1 fxd. WW 3K.n. :1:5% 3w 1 fxd. ww lOKn. ±5% 3w 1 var. ww l.8K.n. - 20.n. DUAL POT 2 var. ww 22K.n.- 2001\.DUAL POT 2 fxd. comp 43K.n. :t:S% iw 1 fxd, comp 62.n. ±5% lw 1 fxd. comp 27Kn. :1:5% tw 1 fxd. met. film 68. lKn. :i:l % V8w 1 fxd. comp 82K.n. :1:5% jw l fxd. met. film 15Kn. ::U% V8w 1 fxd, comp 15Kn. :t5% }w 1 fxd. met. ox 160.n. :t:5% 2w l fxd. comp 3.3Kn. :1:5% !w 1 fxd, WW 3.n. ::!::5%3w 1 Type C.EB T-0 Type CEB T-0 Type CEB T-0 242E-3915 Type C42S EB-2405 242£-24 25 EB-3925 EB-9125 EB-1145 GB-0475 EB-4325 EB-8225 EB-1155 Type 110-F4 EB-1235 EB-2745 242E-3025 242£-10 35 I.R.C. I. R. C. I.R.C. Sprague Coming A.B. Sprague A.B. A.B. A.B. A.B. A.B. A.B. A. B. C. T.S. A. B. A.B. HI.AB Sprague Sprague 07116 07116 07716 56289 16299 01121 56289 01121 01121 01121 01121 01121 01121 01121 11236 01121 01121 09182 56289 56289 0698-51 49 0698-32 83 0698-51 46 0811-17 99 0698-36 29 0686-24 05 0811-18 07 0686-39 25 0686-91 25 0686-11 45 0689-04 75 0686-43 25 0686-82 25 0686-11 55 2100-18 24 0686-12 35 0686-27 45 0811-19 53 0812-00 10 0811-18 16 EB-4335 EB-6205 EB-2735 Type CEA T-0 EB-8235 Type CEA T-0 EB-1535 Type C42S EB-3325 242E3R05 HI.AB HI.AB A.B. A.B. A. 8. I. R. C. A.B. I.R.C. A.B. Coming A.B. Sprague 09182 09182 01121 01121 01121 07716 01121 07716 01121 16299 Oll21 56289 2100-09 95 2100-09 98 0686-43 35 0686-62 05 0686-27 35 0757-04 61 0686-82 35 0757-04 46 0686-15 35 0698-36 25 0686-33 25 0811-12 24 tw tw 6296A 6-6 • l 1 l l 1 l l 1 1 1 1 l l 1 1 1 1 1 1 1 1 1 • l 1 1 .1 1 1 1 1 1 1 1 1 1 • Reference Designator • • R828 RBSO R851. 854. 856, 859 R852.853 R857 R858 R860,863 R864, 867. 861, 862 R866 R868,869 R870 R872 R900 R901 R902 R903 1 vaw 1 fxd. met. film 900.n. :l:l % vaw 4 Stock No, RS EB-6845 Type CEA T-0 A.B. I. R.C. 01121 07716 0686-6845 1 0757-0460 1 2 1 l 2 Type CEA T-0 Type CEA T-0 Type CEB T-0 Type CEB T-0 Type CEB T-0 I. R.C. I. R. C. I. R. C. I. R. C. I. R. C. 07716 07716 07716 07716 07716 0757-1099 0757-0401 0698-5148 0698-3283 0757-0723 fxd, fxd, fxd. var. fxd. fxd, fxd, fxd, fxd, met. film 3.40Kn. :1% lw 4 1 met. film 750.n. :l:l % 2 met. film 36.5Kn. :i:l % 1 WW lOKn. l met. film 2Kn. :1:1 % l comp 39Kn. :!:5% !w l comp 180Kn. :i:5% jw l comp 3Kn. :i:S% !w l comp 33Kn. :i:5% !w Type CEB T-0 Type CEA T-0 Type CEB T-0 Type ll0-F4 Type CEA T-0 EB-3935 EB-3935 EB-3935 EB-3935 I. R. C. I. R. C. I. R.C. C. T. S. I. R. C. A. B. A. B. A.B. B. 07716 07716 07716 11236 07716 01121 01121 01121 01121 0698-4642 0757-0420 0757-0765 2100-0396 0757-0283 0686-3935 0686-1845 0686-3025 0686-3335 Oak 87034 3101-0100 1 HIAB 09182 3100-1910 l 1 1 HIAB HIAB 09182 09182 9100-1824 1 9100-1846 l l HIAB HLAB 09182 09182 9100-2141 9100-1832 1 l HLAB 09182 1902-3070 l 06751 06486 1902-0762 l 1902-0761 l film film film film 100.n. :1:1 % l/8w S.2Kn. :1:1% tw 9. 31 Kn. :i:l % iw 365.n. :l:l % iw vaw tw vaw Pulse Transformer Power Transformer llSV Power Transformer 230V {Special for 230V operation only) Bias Transformer VR600 Code met. met. met. met. T700 T800 T800 VR300 Mfr, orT~e fxd, fxd, fxd, fxd, Switch PL. Lt. (red) ON/OFF l Switch Rotary (meter) 1 3 pole 4 position VR601 • fxd. comp 680Kn. :5% !w fxd. met. film 61.9Kn. :i:l% Sl 52 T801 Mfr. Mfr. Part .ft Qyantit:t'. Descrietion Diode, zener 4.22V :i:5% 400MW Diode, zener 9. 4V :5 % 500MW Diode, zener 6. 2V :i:5% Side Chassis - right Side Chassis - left Chassis - rear Panel - front Heat sink - diode Heat sink - SCR Cover Guard - angle Meter Jt" DUAL SCALE 0-70V 0-4A Meter bezel l mod Meter spring Fuse holder Loe kw asher Nut Washer - neoprene Binding post (maroon} Binding post {black) Rubber feet Knob YB dia. black 1 l A. 54-61681-2 6AlH 1N2163 1N821 U.S. Semcor N. A. Electric l l 1 1 1 l 2 1 HIAB HIAB HLAB HIAB HIAB HIAB HI.AB HIAB 09182 09182 09182 09182 09182 09182 09182 09182 5000-6098 5000-6099 5000-6103 5000-6100 5000-6101 5000-6102 5000-6104 5020-5540 l HI.AB HIAB HIAB Littlefuse Shake proof Littlefuse Llttlefuse HIAB · Superior Stockwell HI.AB 09182 09182 09182 75915 78189 75915 75915 09182 58474 87575 09182 1120-1146 4040-0294 1460-0256 1400-0084 2190-0037 2950-0038 1400-0090 1510-0040 1510-0039 0403-0088 0370-0084 1 4 1 1 1 l l 2 4 l 342014 1224-08 903-12 901-2 DF21 Mn DF21 BC MB-SO 6296A 6-7 l 1 1 1 1 l l l l 1 1 1 1 l l 1 l l l 1 l 1 1 1 l Reference Designator Quantity Description Mfr. Part i or Type Mfr. Mfr. Code CIA-832-2 CIA-632-2 422-13-11013 HI.AB HIAB HI.AB Beldon Heyco Reliance Reliance Sprague Reliance Tinnerman Whitehead Whitehead HIAB HI.AB Penn. Eng. Penn. Eng. Cinch 09182 09182 09182 70903 28520 08530 08530 56289 08530 89032 79307 79307 09182 09182 46384 46384 71785 7835 HI.AB 09182 2 2 1 Knob pointer s/8 dia Knob ! dia red Barrier strip Line cord 7!' PH 151 Strain relief Mica washer Mica washer l" dia Capacitor clamp 3" dia Mica washer s/8 dia Fastener CU-type) Cable clamp YB I. D. Cable clamp I. D. Delrin bushing De lrin bushing Pem nuts -#8-32 Pem nuts *6-32 Jumper (barrier strip) Handle 8" black (color no. Y-12561) l l 2 4 l KH-4096 SR-SP-1 734 4586-2A 2 9 2 1 6 2 4 8 9 t 1 6-32 T4-6 T4-4 Stock N'o. RS i. 0370-0101 1 0370-0179 0360-1:~34 8120-0()50 0400-0013 0340-0174 2190-0'.710 0190-1~n3 l l 1 l l 2190-0:708 1 2 1400-0:332 l 1400-0330 1 0340-0169 2 0340-0171 1 0590-0.395 1 0590-0393 2 0360-1143 2 1440-0042 1 OPTION 07: Voltage 10-Tum Potentiometer 1 Series 8400 I. R. C. 07716 2100-186'.7 1 OPTION 08: Current 10-Tum Potentiometer 1 Series 8400 I.R.C. 07716 2100-202!9 1 OPTION 09: Voltage/Current 10-Tum Pot Voltage 10-Tum Potentiometer Current 10-Tum Potentiometer 1 1 1 (Includes:) Series 8400 Series 8400 I. R. C. I.R.C. 07716 07716 2100-1867 2100-2029 1 OPTION 13: Voltage Decadial Control Voltage 10-Turn Potentiometer Decadial Control 1 1 1 (Includes:) Series 8400 RD-411 I. R. C. I. R. C. 07716 07716 2100-1867 1140-0020 1 1 OPTION 14: Current Decadial Control Current l 0-Tum Potentiometer Decadial Control 1 1 1 (Includes:) Series 8400 RD-411 I. R. C. I. R. C. 07716 07716 2100-2029 1140-0020 1 l 6296A 6-8 ~ • • f 17V Ll A. / ' - V /'-----: V-1 V l--a.33M8-t B. TEST POINT 53 • TEST POINT 54 C. ' UST POINT 59 NOTE 4 J l--8.33MS--I D. • TEST POINT G. NO!ES: £. TEST POUIT 47 F. TUT POINTS 46 • 45 TEST POINT SZ 1. ALl. WAVEFORMS TAKEN WITH llSVAC. 60Kz, SDIGLE·P~ INPUT AT MAXIMUM RATED Ot1TPl1T VOLTAGE AND NO LOAD Z. OSCIUOSCOPE DC COVPtED AND RUtRl:NCED TOT. P. 90 UNUSS OTHERWISE INDICATl:D. 3. WAVEFalMS ARE NOT DRAWN TO SCAIL 4. AMPLITUDE CONNECTED. AMPLITUDES ARE TYPICAL •IOS. MODEL NO. VOLTAGE • 56 8.UMS or WAVEFORM AT T. '· 47 VARIES WITH 6282.l +ISV 6285.l +17V DlrrtRENT MODELS AS FOLLOWS: 6216" 62901. 6Z91A 6296" +ISV +ZOV +17V +zov !METERING] IR EF.ERE-NCEI tso1 ql00-18~2 jCURRENT INPUT] C.IZ 60C I~ • ® rle ~I 14!) 13y_ .---- creioo ~4 f!? ~ 151 c2&01 ~I t ' I .:=.. "T" li;?OOf"'t 40V v®-1.zv "' s.s. C.~80'2. 1 I I ....':~A f Clt804 ..: ~ ..-: " ... ._ ~ N ~~: CR303 ZIV j ••• £.fll' t.&17 H:i::i,c: ~·· Vaw,11. C&fS I~ CJ.401 r C.t40"- SA µ, R8l' 3.3K CR801 .< s l"71Z JZI(' ''F • I 1 I I I I I~ II t I I ' .___ @ L. 1(001 .l.; 0.1.,,:f 1 T4oov I . _J 4 rt7 leoo 9100-184, [s.c. R-.-COi'Jr ROL I 4li700 IS • U...A.J..} 9100-/6Z-I 12: 7o3 R"1ro -M 1,1.MEG.. 12.7 1 ' Jm z • TBOI GATING VOLT~GE INPUT SR61& -0{-s Y 100 1~ ~ F.P.NOTE~~ /, DC VOl.TAGES WD.E MEASUllZD UNtlD THE FOUOWING CONDmONS: l. 'llMl'BON MODEl. 269 OR IQUIVAl&NT U5VAC INPUT 2. ), V01.DGl:5 UFEIENCED·TO 4. VNUBS OTHDWISE JNDtCATlD 4, V01.DGl:S .U:E TYPICAL. •lO'J. UNLESS OTHZllWISZ: INDICATED ~. A1L UllJINGS 't.lUN WITH SUPPLY 1N CONSTANT VOLUGE OPDATION A'f WAXJMUM RA.TED OUTPUT WITH NO LOAD CONNtC'ftD. CUUENt COJC1ROl,I SHOUl.D BE TUaNZJJ ruLl.Y a.oa:ww;. 2. i.LL. Ef;~IST"Of!~ A.Ee 1/zW., 5'7o UNLE~S NOTED oTHEIZ. w1o;i.E • 3 1" OENOTES 2.0 PPM WI~• T'eMp:t, C:.OE!S,-. 4. £.e'A.£ T£2.t,wro,,~L. ~ '!ii'-IOWN IN ....iPi:MA.L ~T~Af"Pt-.i6. MEA~ut:ED ·AT u;.,,, r...1J.Je , ~o 1..0AP. ~. 2eF. 'yo1..TACa.e,.:> 6. 7. T - - ~IOYT L- L Sl6~A. Dt+i0TE• C.vE.lte.uT "5.l~frJA.&. \ - - - - DENOTe$. VO&..TA<-E VALUE', SLEC.TE.c--u· ~Toe:Y U£ OPT~tJM Pit.~oeM~Nce DE"N~S -..Lo~IAIA&. ' Model 6296A, Schematic Diagram • OAS OA7 0 AG OAS • OA2 o+s OA1 ~: I CATMODE!> O<' A~c DIODES Z. ToWAii::PS &OTTOM Oi= FA<E eoA~ D. TE.Alt.J~IST..;£. BASE-$ FACE To WAi:t>5 TME R.•COMT OF BoA.i:.D. EXCEPT OT\.IEew~....ioTED. ALL. Ii 3 ON M00EL5 r.Z82A, C:.Z85A, G>Z8r.A AND r.zq1A, CR400.CR501.CR503, AND CRSoq MOUNTED ON HEAT 51NK5 ~OT PRINTED CIRCUIT BOARD. • .. Co E B 4. ON MODELS r.zqoA AND C:.Z~C:.A, CR400, CR501, CR~3, CR80'7 MOUNTED ON PRINTED CIRWIT SOARD NOT HEAT 51NK5 ARE 5. ON MODEL5 <'.Z85A, <lo2qol <lozq1A, AND c:,2q.:.A, R401 AND Q401 ARE NOT U5ED ANO R400 15 l?E"Pt:A5ED WITH A JUMPER • I..., I I I ' ~ TJOO I I I I ....,I OAS 0 A7 I .. 0 A6 o+ 0 AS 0 :'.l I ! ., ..., @-.__ r-;:---19\---0 @.)../ I .., ! 1 11 1 II 1 ~ ~ e 1 0II ~ ~ I -T I ~ '~ OAl I. Z. ~~~:::; ~~T~~~ t>~o:E:o::~~ l A.L.L. Ti!AJJ~IST-'C. 8AS.E~ FACE TME ~•Ul-IT OF ~o•t:.D. rowAtb~ E.:W:C.EPT OTHEC.W~NOTEO, I A\ rr::--:.\\ \ \ ...___..,,;I J CR504 \ •/ ~0 rr::--:.\\ ,-.:. 0 A2 I i( /t~ NOTE: 1I 11 3 ., 1 I :;: I r-/."" I o+s I 0 . ~ ., ~ iu--~ tO\ I I ~ R309 1 . ~5 1 ~~ I Co ( 3. ON M00£LS G.282A, C.tSSA, c.ze~A AND c;.rq1A, CR~OO,CR'SOl.CR'!K>!, ANO CR801 MOUNTED ON HEAT 51NK!5 NOT PRINTED CIRCUll" BOARD. •. ON MODELS iotqoA ANO iozqi;.A, CR<OO, MOUNTED ON PRINTED I 5. o~ CIRCUIT BOARD CR~I. CR~B, CR 809 ARE NOT HEAT 51NK5 MODEL:. ioze5 .... 1aqoA. r;,zq1A, AND IOZ'lroA, R'IOI AND Q'IOI ARE NOT U!5ED AND R-400 1:5 F1EPl:A5£0 WITH A JUMPE~ APPENDIX A Option 11, OVervoltaqe Protection "Crowbarn • D~CRIPTION: This option is installed in DC Power Supplies, 6282A, 6285A, 6286A, 6290A, 6291A, and 6296A, and tested at the factory. It consists of a printed circuit board, screwdriver -type front panel potentiome ter, and six wires that are soldered to the main power supply board. The crowbar monitors the output voltaqe of the power supply and fires an SCR that effectively shorts the output when it exceeds the preset trip voltage. The trip voltage is determined by the setting of the CROWBAR ADJUST control on the front panel. The trip voltage range is as follows: Model 6282A 6285A 6286A 6290A 6291A 6296A Trip Voltage Range l-13V 2-22v 2-22V 5·42V S-42V 6-66V To prevent transients from falsely tripping the crowbar, the trip voltage must be set higher than the power supply output voltage by the following margin: 7% of the output voltage +lV. The margin represents the minimum crowbar trip setting for a given output voltage: the trip voltage can always be set higher than this margin. OPERATION: 1. Tum the CROWBAR ADJUST fully clockwise to set the trip voltage to maximum. • • 2. Set the power supply VOLTAGE control for the desired crowbar trip voltage. To prevent false crowbar tripping, the trip voltage should exceed the desired output voltage by the following amount: 7% of the output voltage +lV. 3. Slowly turn the CROWBAR ADJUST ccw until the crowbar trips, output goes to OV or a small positive voltage. 4. The crowbar will remain activated and the output shorted until the supply is turned off. To reset the crowbar, tum the ·supply off, then on• MPB-5 A-1 Table A-1. Replaceable Parts REF. DE SIG. DESCRIPTION TO MFR. PART NO. MFR. CODE HP PART NO. RS Cl fxd, film .l1o1-F 200Vdc 1 192Pl0492 56289 0160-0168. 1 CRl-4 CR6 CR7 Diode, Si. 200rnA 200p"rv Re ct. Si. l 2A 1OOprv SCR 8A 200prv 4 1 1 1N485B 1Nl200A 2N3669 09182 02735 02735 1901-0033 1901-0002 1884-0019 1 1 Ql 02 Q3 SS NPN Si. SS NPN Si. SS PNP Si. 1 1 1 2N2714 2N3417 TZ173 03508 03508 56289 1854-0027 1854-0087 1853-0099 Rl R2 R3 R4 R6 R7 RB R9 RlO Rll Rl2 Rl3 fxd, fxd, fxd, fxd, fxd, fxd, fxd, fxd, fxd, var. fxd, fxd, 1 1 1 EB-7515 EB-2045 EB-1035 EB-3925 EB-47G5 C425 Type C42S Type CEA T-0 242£3325 01121 01121 01121 01121 01121 16299 16299 07716 56289 09182 09182 01121 0686-7515 0686-2045 0686-1035 0686-3925 0698-0001 0698-3626 0698-3626 0757-0283 0811-1809 2100-185 0 0811-1848 0686-2045 1 1 1 1 Tl Pulse Transformer l 09182 9100-1824 1 VRl Diode, zener S,62V :1:5% l 07716 1902-3104 l 1 1 09182 09182 1400-0052 2950-0034 1 1 09182 09182 06296-60021 5000-6225 1 09182 06296-60003 tw tw tw tw comp 750.n. :1:5% comp 200Kn. :1:5% t W comp lOKn. :1:5% comp 3.9Kn. ::1:5% comp 4.7,,. :1:5% !W comp 47.n. :1:5% met. ox. 180.n. :5% 2W met. film 2Kn. :i:l % l/8W comp 3.3Kn. :1:1% l/BW WW 22Kn. :1:10% 2W WW 0.5.n. :1:5% SW comp 200Kn. :5% l 1 1 l 1 1 1 1 tw 1 EB-2045 1N3512 4 1 l 1 1 1 1 1 1 l 1 l MISCELIANEOUS Bushing, Potentiometer Nut, Hex Printed Circuit Board Assembly, Includes Components Printed Circuit Board, Bracket Modified Front Panel, Includes Components 6296A A-2 • • .- --.,Oba .. DC POWER SUPPLY -Hti-A- --. FROM FROllTP44 TPllO-----+----~+~ 4V ::::::::::::::::::::;;----,----,~ C•15vr.;.·---t----;;::;;;::;;;;;::::::::::;;::::;;::::::::::::::;;::;;:::::::::::::::::::: Rl2 0.$ U'J..5W CR6 +15.4Y 114 :S9K 112 •1750 • CR7 ZOOK CAI CR4 0 Rll UIC -s ______...._______________________ © ~....... -OUT NOTES: I. ALL RESISTORS ARE 1111 OHMS. 112 W, !~" UNLESS OTHERWISE NOTED. Z. ALL CAPACITORS ARE IN ltlCROl'ARADS UNLESS OTHERWISE NOTED. CIRCUIT PATENTS APPLIED FOR LICElllSE TO USE MUST BE 08TAINEO IN WRITllllG FllOll "EWLETTPACURD CO. ttARR 150111 DIVISION Figure A-1. Model 6296A Over-Voltage Protec tion Crowb ar • A-3 F//~ HEWLETT ' ~f:.a PACKARD Primed in CSA Order Part Number 06296-9000 I E l 2M1-l • I 090 Manufacturing Part !\umber 06296-90001 1111111111111111111111111111111111111111111111111111111111111 llll